I have 2 snakes in tanks, all the rest of my balls are in a rack.
My normal started out in a tank, then I bought a rack so he went in there, then we ran out of room in there, so back into a tank he went. Then my red tail boa is in a big tank with a screen top and sliding glass front doors.
I have saran wrap covering half of both of the screen tops. That keeps the humidity at around 55 in the ball tank and 60 in the boa tank (she has a much bigger water bowl). I have zoo-med UTH's on both tanks. I don't have any problems with them.
I would prefer my normal to be in a rack, simply because it is easier than dealing with the screen clips, but my morphs get rack priority over him.
I like my boa to be in a tank because she is my display snake, and the sliding doors make things easy.