AOA charges for shipping on the used guns, but that's still a pretty good deal for the 95. If I didn't already have too many guns, it would be tempting....who are we kidding, I'm still tempted anyway!
AOA also has a used RWS 34 carbine in .177 (no provision for open sights on this one) for $189.
https://www.airgunsofarizona.com/usedguns.html/rws-diana-34-pro-compact-.177-no-scope-used/ That's a good deal too, but my vote would be for the Hw95 in .22. At that price, you'll probably be able to sell it and only be out the cost of shipping (which is really quite nominal if you think of it as a "gun rental" cost.) if you later decide you want something else. But my guess is that, once you try it, you'll be keeping it (and probably adding to your collection as well like the rest of us....)
I'm curious what drove your caliber selection. Personally, at the typical factory power levels of either gun, I prefer .22 over .177. Pellets are bigger and easier to handle and offer considerably more smack when they hit a target, whether you're plinking or hunting. But the "which caliber is better" question is really a matter of personal taste - arguments can be made either way.
Come to think of it, what is driving your choice of airguns? In other words, why only consider the medium-high powered HW95 and the RWS34? You mention you're new to the forum and tried a Gamo, but are you new to airguns in general? It's very easy to get sucked into the power/velocity numbers that are advertised because we all want more, more, more! But what you'll quickly find out (at least with respect to springers) is that more power comes with a tradeoff : higher power guns are generally harder to shoot accurately. Many people really like the HW50 (currently about $280 to your door from Krale) as a good "Goldilocks" gun - enough power for hunting small game but trim and easy to shoot. If you're really looking for a plinker that might be called upon occasionally to defend the bird feeder, the HW30 is an excellent option. It's smaller and lighter, but don't mistake this for a "youth gun": it has a full, adult-sized length of pull and the same Weihrauch quality as its bigger brothers, but cocks super easy and they usually shoot like a llaser. And it will absolutely take out a squirrel up to 20 yards no problem with well-placed headshots. I have two of these (one scoped, one open sights) and they are the guns I tend to pick up most by far. Currently, those are about $250 shipped to your door from Krale, which is pretty great!
Good luck and welcome to AGN!