As far as what kind of Betta... really just whatever catches my eye :) Yes my planters are deeper like buckets. The fountain is about 1' deep but it also sits in a more shaded area. This year I also hope to add a stock trough for growing water chestnuts and it, too, will get a resident betta :) I haven't tried to spawn before now but may try it out especially if I can get that set up this year.
I had just found and was reading your post
on your setups. Nice! I agree with your natural selection views 100% If we always coddle the weaker ones then it weakens the species as a whole.