Can't say which is the best tbh, we have one but bought it from a sex shop.
We haven't used it that much as it's a faff to turn over etc etc
Hubby made some spreader bars the other week which do a similar job ie you can't touch yourself or touch them when they are touching you, but it makes it easier to turn over as you're not restrained to the bed.
Obviously, you could still be restrained to the bed if they tie the bars to the bed
Have only tried the sex and mischief one so couldn't say how its compares but we really enjoy it. Fits easily on our double bed but can be adjusted quite alot. Agree it is a bit of a hassle if you want to turn over but that would be the case with all the bed restraints (planning on getting a spreader bar myself)
we have the 2nd one down on a double bed- its brill. The cuffs are comfortable on your wrists. We just leave it under the bed to save having to put it on the bed each time. Sometimes use with a spreader bar too.