If you're planning live plants, the 37 will prove more difficult to light appropriately.
You may also find that the small footprint:volume
The tank is already set up, he's including 2 fish and all the plants in the deal as well.
As for what I am planning to put
Bigger is always better.
1) from my experience, only Salt combinded with a higher temp has ever cured ICK.
2) I would make sure that zebras are healthy before starting
Keep the WC up, and maybe do a few bigger ones. Then the day (or time) of move just a slow acclimate would be OK. IMO--Frogs can handle bigger PH swings.