Here is my take on the types of indoor trainers.

Rollers: Takes a good amount of concentration, maybe less if you get one with parabolic drums. Most road like feel even without the head wind.

Rollers with fork mount: Feels OK (I've had one). I've read that prolonged use of the fork mount could index the bearings in the headset. For me, it was a pain in the but to mount and dismount the wheel but that's because I'm lazy. No concentration required to balance so you could watch TV or a workout video.

Cyclops Fluid2: This is what I currently have. The resistance is tough on a single speed. Ideally you would use this with a geared bike to vary resistance. No concentration required to balance so you could watch TV or a workout video. Quick to disconnect bike and ride outside (unless you find a $48 gem to leave on it).

Cyclops Magneto (not Mag or Mag+): Less resistance than Fluid2 but still more than the resistance unit I had on my Performance Rollers. Seemed very smooth on the one I tried out.