Of the 3, I agree the Plus is the one that has improved the most versus last year model, but in the end, these flagships phones are so so good nowadays that most improvements aren't earth shattering.
For me, the extra screen resolution is nice, but with the S23+ I never thought it needed more PPI. I'm probably keeping the S24+ with FHD+ just to have more battery, which to me is the biggest selling point today in a phone. Same happens with the RAM, I believe 8GB is plenty enough for a phone, at least for now. Future proofing is great, no doubt.
I'm actually disappointed with the aluminium frame. My S23+ was barely 5 months old and somehow got a small scuff on the frame, on the bottom. I've been SUPER careful with the phone all this time, so no clue how it got it. This new one, the S24+, will stay 99% of the time with a case just for peace of mind 😅
I'm still in the first 24 hours of owning the S24+, but right now I'm very happy with the upgrade. I really hope to keep this phone for more than 3/4 years. Haven't had a phone longer than 2 years for ever. It's time for me to change that. This phone, with 512GB storage, 12GB RAM, big bright 120Hz screen, almost 5000mah battery, AI features, good processor, triple camera setup with 3x optical zoom, and 7 years of promised updates SHOULD help me achieve this goal. I mean, what more could I possible need? Seriously? Do I really need more RAM, storage or battery? As long as this phone doesn't slow down heavily, I see no need to upgrade in years. For this, I also have to be extremely careful and keep the phone in good condition. In 6 months/1 year this phone will lose a lot of its value, so it's not worth it to me to sell it soon for anything else.
Oh, and this new app some other member of this forum showed me, called Local Send, is AMAZING and has solved almost all of my issues with file transfers to my iMac. It has been super important for me to stay with Android and not go back to iOS.
This S24+ has SO MUCH hardware, that I'm probably skipping buying a new tablet for the foreseeable future. I was considering buying the next iPad Pro 11 or 12, but I think it would be overkill for my needs.