I did a quick google search to remember the correct spelling of the name of my trainer to cite here and in my search found a good link on trainer differences.
https://www.livestrong.com/article/3...bike-trainers/
I personally like a magnetic resistance trainer over a fluid trainer, but I am clearly in the minority. I have a Kurt Kinetic magnetic trainer. I picked up an old low mileage bike leaning against a garbage bin that looked like it would be a great trainer bike, I hated to see it go to the landfill. So, I re-greased a few parts and put on a new chain, different pedals, different saddle. It is permanently stationed on my trainer and I leave it in high gear. I use the magnetic system to adjust drag.
A fluid trainer is not adjustable like a magnetic trainer, thus you adjust your gears for more or less resistance.
A good fluid one will approximate the resistance that you feel on the road. If you are trying to keep statistics from one workout to the next, you want the fluid trainer. A magnetic one would be bad for comparing statistics from one day to the next because it is adjustable so you would be comparing apples with grapefruits. I am a low wattage rider, I have never overheated a trainer or a trainer tire.
It is important to use a stand under the front wheel to raise it up so your bike is positioned the same as it would be on a horizontal road.
Some people put a mat under the bike to catch sweat drips, etc., I use a beach towel.