Benefits of going to a 37:
You will gain a lot of water volume which would aid stability.
You would gain another 6 inches in length.
The added height would be good if you want angel fish.
The height of the tank makes planting and other maintenance jobs harder.
Need more light to reach the bottom due to the height.
I personally like the proportions of the 37 (kind of like watching a TV screen) but you are limited by the 12" depth (the same as the 25). I know I was up to my armpit in water if I had to reach down to the bottom.
My favorite tanks (proportion wise and all around usability) are the 20L, 40 Breeder, and the standard 75.
I have to agree with all of these remarks. I love my 37 but maintenance is a PITA. Especially when i have to trim low plants like DHG and lighting was not easy. I would have liked to go with a 40B but the dimensions of my stand would not allow the depth.