I used float trays last year. If you have a greenhouse you can't beat them. If you're going to try to use them in the house like I did, you're asking for a godawful mess. 1020 trays are great in the house. For the float trays, I had to build 2'x3' square frames out of 1x6's and line it plastic (for each tray, they take up a lot of space). It takes a lot of water inside the frame. When it comes time to move the trays outside and back inside, you get water everywhere. If you pull a tray out for a haircut, you get water everywhere. When the plants can stay outside, it's time to take all those gallons of water back out of the float tray frames. I did this with a bucket and no matter how careful you are, you get water all over the floor. Then you have to have a place to store those frames for the rest of the year. That's why I went with 1020 trays this year. Just add water about every third day, no mess. You can move the insert and tray anywhere you want without spilling water, and you can fit twice as many trays in the same area.
If I had a greenhouse, I would use float trays for sure. But if I use them in the house again, my wife is liable to leave me with only half a house.