Canon - Upgrading Camera - Picture Style Question

Newer models will take an imported picture style, but as far as having C1-C3 modes, they don't, thus your PASM will inherit whatever your last picture style is just like your T1I does IE T7i / 77D has the same support and quirks on picture styles as your T1i.

I'll second other folks and say JPG + RAW is probably a good idea. I'm a 100% JPEG-er these days but I used to be 100% RAW too. If you have the external hard drive space, and SD card speed, RAWs are very valuable if should ever decide to post process them at a future time, even distant future. I'm still reprocessing old XTi, T3i, PowerShot G1X II, 5DIII, EOS M/2/3 RAWs every now and again for prints. They retain original colors should you desire to tweak them, and WB shifts, as well as carries full resolution with no compression vs JPG compresses and you loose WB post shift and color shifts. When you choose to use an image, either share or print, this becomes incredibly valuable to squeeze every last ounce out of what you shot.

Also consider DPP4, it's free via Canon. Allows you to post process pictures styles on RAWs, not video though obviously.

Oh and you should see my post, I won't search it, but your T1i, if you shoot RAW, and then digest the RAWs straight to JPG with no edits in DPP4, will result in a solid 1 stop gain in ISO handling on your old T1i. It's like having a new camera, for free. Once again, if you have an SD card that can keep up with RAWs and the hard drive space to store em.