I know it's been said that we shouldn't compare the Sims 3 and Sims 4 DLC release schedules, but given the recent tension I thought it would be interesting to see. So I created a timeline that should make comparisons easier. Numbers aren't necessarily completely exact, and I apologize for the mediocre quality.

Hopefully someone will find this interesting or useful.
Comments
Thank you for taking the time to make this awesome timeline. Good job.
“Instead of putting players in the role of Luke Skywalker, or Frodo Baggins, I'd rather put them in the role of George Lucas.”Will Wright.
Complexity is our enemy when building The Sims, so we look for any opportunity to keep it down. (c) - @SimGuruMax (LINK)
That part's subjective. At this point, I was still meh about all the Sims 3 packs, personally (but had all the EPs at this point, and an SP), and my recommended-level computer wasn't keen on Bridgeport.
Not really. Graham said apart from the gameplay added in SPs, the rest of the items and stuff are outsourced.
I think it ultimately depends on what content you are looking for. Sims 4 certainly looks fine for people who enjoy stuff packs.
On the one hand I'm concerned about the lack of supernaturals in Sims 4, since they have only added aliens in the period Sims 3 added four (mummies, simbots, vampires and imaginary friends). But then when I thought about it, the only one of those I actually played frequently were imaginary friends, and it wasn't until Supernatural and Seasons that I got the ones I really enjoyed. I do wish we had more worlds though.
Sims 4 DLC has been better paced than I expected it to be going in. I had to fix the image slightly though, as I'd made a mistake with the length of the coming summer. It's a bit more of a noticeable gap coming up now.
You forgot the Store content.
*CAW... So much added by just a wonderful tool. Stories.... imagination.- Awesomeness.
I didn't forget it, I just had to leave out store content for the Sims 3 to avoid cluttering it too much. You'll notice I did add the new neighborhoods released on the store.
It's why I also didn't add the free patch content released for the Sims 4.
Because you'd have to add free patch content released for TS3, too? *& the free Optional Store sets.
Yes, I'm sure it'd clutter it up... might just have a Huge Store panel across the top of TS3 timeline.
I couldn't afford much of the store in the beginning... was so happy when I got WA and 10$ in free Simpoints.
Regardless, this is awesome. Very curious to see how the next few months play out ^_^b
EDIT: Granted, it is a bit of a sore spot of no known EP03 launch date. Because otherwise the release times for gameplay upgrades (GPs and EPs) look nearly identical.
Add Manage Neighbourhood Options - assign your own Sim to NPC jobs!
The Problems with Death in The Sims 4
Distinguish Elder gameplay with Elder-only reward traits
Filter Rugs by Room Size
I don't think that this will ever work as a true comparison unless the store sets are included. You can't make a true comparison chart but choose to omit half of the content released for one of the games; that will only work to make you look biased as the creator in favour of making the situation of content releases for look TS4 far better than it actually is.
Although did end up getting a cool bathtub I think which was the most expensive item I picked like around 50 Sp.
TS4 looks like a jumbled, unpredictable mess. How about we remove the stuff packs, or at least the frequency of them, and put the resources gained towards game packs, and try to push for putting out at least one expansion that we know we could always expect to see on a specific quarter of the year?
Actually in all fairness when you look at the GPs and EPs for TS4 on the timeline they're not that far out of sync with the EPs and SPs of TS3; the difference is that the gaps for them in TS4 have varied a little; they haven't followed the strict three month pattern between releases in TS3. I think we've also come to expect more as a consumer simply because we were so overindulged with TS3 Store and the fortnightly content releases. Now if you consider TS4 SPs to be replacing store content then we're still not getting as much as we did in TS3and it's nowhere near as consistent; some view this as a good thing; many wanted less content for TS4 after complaining that TS3 Store was simply a step too far and piled on too much content; others are disappointed (such as myself) because they enjoyed the Store content and felt that it gave new life to the game twice a month; there was always something to look forward to and hey, if you didn't like the content you didn't have to buy it but it was certainly nice to have the option. I think that's the main issue with TS4; the lack of any consistent release schedule and the drop in the number of releases purely because we no longer have the Store dropping packs in the way it did.
I don't see where this argument counters what ravamaile said tbh.