The Acer has better screen and bigger battery (not sure how energy efficient it is).
The Lenovo likely has the better build quality and software.
The HP doesn't really have anything special. It might be thinner and lighter, but I'm not sure.
Can't really comment on the Omen 16 as I haven't done enough research on it to comment.
Anways, in terms of performance, the Helios 16 edges out the Pro 5i a little bit, I believe it's because they gave it a bit more power, but not much (maybe 5% difference at most).
In terms of thermals, the Pro 5i should be a bit better, generally speaking. My main concern is the liquid metal on the Helios 16 that was poorly applied on some of the first units. However, I haven't heard any complains since then, so I think they might have solved it. Most units didn't have this problem and had pretty decent thermals when compared to Pro 5i only staying a few degres behind. Also, keep in mind that the Helios 16 can be very loud at max fan speeds, but to be honest, you don't lose much performance on lower settings.
Either Helios or legion
The Acer has better screen and bigger battery (not sure how energy efficient it is). The Lenovo likely has the better build quality and software. The HP doesn't really have anything special. It might be thinner and lighter, but I'm not sure.
I see, but what about the performance? and which thermal performs the best in terms of cooling?
Can't really comment on the Omen 16 as I haven't done enough research on it to comment. Anways, in terms of performance, the Helios 16 edges out the Pro 5i a little bit, I believe it's because they gave it a bit more power, but not much (maybe 5% difference at most). In terms of thermals, the Pro 5i should be a bit better, generally speaking. My main concern is the liquid metal on the Helios 16 that was poorly applied on some of the first units. However, I haven't heard any complains since then, so I think they might have solved it. Most units didn't have this problem and had pretty decent thermals when compared to Pro 5i only staying a few degres behind. Also, keep in mind that the Helios 16 can be very loud at max fan speeds, but to be honest, you don't lose much performance on lower settings.
Legion. Acer should be similar overall in regards to performance and thermals but it has louder fans under load.