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.
Cons:
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.
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