GOod answers, and I am going to say basically the same thing. I like foundation - less because its CHEAP... If I didnt mind spending the money, I would probably use wood frames with plastic foundation. Black foundation, easier to spot eggs and young larvae.
All plastic frames? NO! I have quite a few Mann Lake PF120s and I do not like them.. No Hive beetles here to hide in the recesses, but they FLEX when you want to pry them out, and that squashes bees, and they you have a hades of a mess with angry bees after you... It takes extra care not to flex them when prying them out of the propolis the bees glued them down and together with. When they get older, they will start to crack and break. Wood you can fix pretty quick and easy. Plastic isnt as easy to make as good as it was.
I wont buy more of the ALL plastic frames, I learned my lesson. Wood and plastic, wood and wax, and wood and.... empty, all work pretty well.