Well, there are better t-shirts for RAW shooters.
You will get better results with RAW, but the difference is very small especially if your manipulations of the photo are going to be minimal and your lighting was good, and lighting color was good etc. 10+ years ago cameras made horrible jpegs and there was more of a difference.
I shoot RAW+Jpeg 100% of the time, and for casual shooting, 90% of the time I use the jpeg. For Serious work I use the RAW.