I want to like both so badly. The 8.25 comes in the best graphics and every shop everywhere has several in stock at all times.
The 8.25 boards have always been on the shorter mold, so they tend to be steeper as well, when compared to something like the 8.38 boards which seem to be way less steep overall when comparing any number of each of them. Maybe finding boards with IV on top could help if they feel too quick in the kicks, or riding trucks with shorter wheelbases, even if you are not a fan of Indy, as per previous comments.
I know how much that 8.25 does work well on any Indy trucks, as I have one myself, but it is personal opinion and if something doesn't work for you, there is no point trying to struggle with it, just to have it make life harder every time you step on a board. I did also have it set up on Thunders and even tried it on Ventures just to see, but prefer Indy for the wheelbase.
Another 8.25 Full, not SE with 14.5 wb I put Ace trucks on and it worked well enough too, but that is a different board again.
Probably doesn't count so much for me though, as I have almost one of everything set up in some form or another, just to see what they are like and to let people skate them if they are not sure of what a board shape or mix of brands / parts might feel like.