I had an Rx1(Hw90) and have an R1 (Hw80). They are both good guns.
First thing to clear up a Hw90 is not a gas ram in the regard that people are familiar with. It's a Theoben air piston.. They are not a sealed gas ram that need replacing. The worst thing that can go wrong with the air piston is the orings leak. First they're not prone to that and second if they did they can be replaced for pennies. Yes it is a piston charged for high pressure, but it's charged with air, not nitrogen. Plus its comparatively massive so it's highly unlikely to fail. Which brings me to say you'll need to replace a main spring long before you need to replace the o-rings. So the 90 is much cheaper to maintain.
Second the Elite trigger is actually a very good trigger and it is adjustable. Most of the information on the net about adjusting it is wrong. Yes the the range of adjustment isn't as much as the Rekord, but it's plenty when done right.
The 90 is stiffer to cock than an 80 but it also makes a tad more power. It's most noticeable at the beginning of the cocking stroke as it starts off hard on stays that way. It's a more linear pressure than the 80 which the pressure builds exponentially. Either gun you're not going to plink for hours with.
Not a giant deal for most people, but a 90 can be left cocked indefinitely and the trigger is more easily reset. This makes it a born to pest gun.
It's hard to imagine, but the 90 is a slightly heavier than the 80. IMO both are too heavy to carry around in the woods.
I like the shot cycle of the 90 over the 80 for the same output. A 20 fpe 90 is shoots nicely. A 20 fpe 80 is going to be a bit harsher. Forget a 80 at 23 if you can even get it there. The 90 has a different shot cycle because it's a longer stroke and uses compressed air. I like it some may not.
Magnum springers aren't my thing so I'm being completely pragmatic here. If you want a nice shooting gun with the most power go with the 90. If you want a traditional springer that's simpler, a little lighter and ok with a little less power go with the 80.
Accuracy, I almost forgot accuracy. They can both be as accurate as the other. I found the Rx1 easier to shoot accurately. Basically it required less concentration for same size groups at 50 yds. Generally quarter sized or better. The R1 would do that but since it's harsher for near the same power it requires a lot more attention to do so.
Neither gun is a bad choice. They are both excellent quality guns with different features. I just wanted to give you an accurate comparison of the two so you can make the right decision for you.
Good luck & enjoy
Ron