Do people have a preference for either player at the various sizes?

I'm currently much prefering p2 at 5x5. But I think that's because I like to make messy grids with lots of small potential features in them, therefore aiming for 3 long chains.

I also prefer p2 in 5x5 but my opinion probably should not count. In bigger grids I'm hell sure it doesn't!

I prefer p1 in 5x5

I feel more comfortable as player 1 in 5x5

Let's not talk about it - let's do it. Monthly cup - NOW!
:-D

I used to prefer p2 but now, I clearly prefer p1.

Doesn't really matter to me, since I always win. Tho facing a first player is much more rewarding as I not only play perfectly but also cause my opponent's mistake.