Definitely get a 20L over a 20H! For filtration, if you're going HOB, I'd go Aquaclear. Don't really have huge preferences for heaters. Will the single betta be the only inhabitant of the tank?
20 gallon tanks generally come in 2 dimensions. 20L = 20 long, 20H = 20 high. 20L tanks are better for bettas because they allow for more horizontal swimming room. HOB = hang on back (filters).
Get a 20L tank with a hob filter with flow rate of 100(baffle it), and 100 watt heater, decorations/hiding spaces for your community, right type of food that'll accommodate the whole tank (i say new life spectrum community pellets will be good) etc.... Good luck with community set up!!!
Thanks for your help everyone - anyone have any further suggestions before I head out to the store in a few hours?
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