Entangle is 20' square on the ground. STR save or be restrained, STR check to get out. Somatic components so it takes a free hand. Max length 1 minute.
Web is a 20' cube, so it also gets fliers, those on walls, etc. However, if it isn't anchored it collapses in next turn to be 20'x20'x5' (high). It lightly obscures the area in it. You do not make a save when it is cast, you make a save at the start of every round you are in it and when you enter it. So the first round is basically the same unless someone else moves you out (or in), but after that you can get re-caught and others entering can get caught. With it being difficult terrain it is not guaranteed that you will be able to get out in one round even if you make your save if there are walls and such around. It's a DEX save to be caught, not STR. Though it's still a STR check to get out. And lastly the webs are flammable. It's both somatic and material components, which is actually easier if you have a spell focus.
Both are difficult terrain and require concentration.
So one is ground only, and only when you cast it. The other is cubic, continues to work, and you can concentrate for up to an hour so you can set it in place early for an ambush or to keep weak foes held so you can interrogate them.
