I have had the ability to try out a ton of different cubes for OH, so I will give you my opinions on all of them.
First GAN cubes can perform well in OH, but they can lock up a lot during F moves especially, but their lightness makes them easier to do long sessions on, but I wouldn't recommend them.
The X-Man XT3 is another good choice, but it can be a bit unstable at times, though it does turn very fluidly most of the time and I have been able to get some really good times with it, but it was a bit more inconsistent for me. I wouldn't recommend any of the Tornado's since they are pretty heavy puzzles so it will be more tiring to solve, but they don't perform much worse than the XT3 so if you already have one then you could try it out, but the XT3 I the best OH cube from Qiyi.
Moyu cubes are probably the best OH cubes on the market right now, mainly the RS3M V5, WR M V10 and the Ferrocore WR M V10, and the Huameng TG. I haven't used my V5 in a bit so I don't completely remember how it performs, but it can be pretty quick and easy to turn and the magnet strength is pretty perfect for OH, as well as being able to be a bit looser while performing well. I would recommend it for how cheap it is and how well it performs, and it has broken World Records so it is a proven puzzle.
The Huameng TG is an interesting puzzle for OH, but if you lower the edge-core magnet strength then it will perform better because with them higher the puzzle just feels like it glides through each turn with zero effort and that can make it uncontrollable with OH, so lowering the strength gives you some more controllability while losing very little of the effortless turning. Though its tension system is just a bit tight, but it's hardly an issue in my opinion. It does occasionally lock up, but they aren't too bad and the don't happen that much, so this is also a good puzzle for OH.
Now for the V10's, first the unmodded one performs very well, though it is a bit tight with the tensions so it can't get very loose, but it still performs very well. Now the Ferrocore is an improvement to the V10 in every way in my opinion, since it gives it a looser tension system which fixes the tight tensions it had, as well as a slightly different magnet strength that I feel benefits OH more. I have been able to turn it very quickly and fluidly and it just works and doesn't lock up very often. Though it does have matte plastic instead of UV coating, so that might be a deal breaker for some people, but if UV isn't a necessity for you then this is a great puzzle.
Overall I would recommend the RS3M V5 or X-Man XT3 if you're on a budget since they both perform really well for the cost, but I would lean towards the V5. But if price isn't an issue I would recommend the V10 over the TG, and the Ferrocore over the unmodded V10, since it is just making improvements against the V10 with the looser tensions and similar stability, aside from the fact that it has matte plastic instead of UV. If you have any other questions or want to hear about some other puzzles, maybe any 3x3's you have that I didn't mention, I could give my opinion on them as OH cubes.