I've been using the ARES 4.5-27x50 for a bit and it has held up admirably and will work fine for all of the applications you mention. Now, it is not a replacement for a $3k scope, so you kinda need to decide how much money you are willing to spend.
Also, how close of a parallax do you need? For rimfire, for me, anything that focuses down to 35-50 yards is good enough, but for airguns 10 yard parallax is a really nice thing to have.
I have been looking at a bunch of scope recently and if you want 20x or more magnification in a FFP scope, in the under $800 range, the Ares is pretty much your only good option.
If you are willing to go up to around $1k, I like the Vortex PST Gen 2 a little more in terms of optics and turret feel. Both held zero and adjusted well enough in my use. The Gen 2 does not focus as close, so if you need 10 yard parallax, Ares is still your best bet.
Mind you, I do not want to speculate on the prices you are going to get used, so I am going off of regular new prices.
To do better than these two in a 20x or higher scope, you really need to go up in price a fair bit. The next step up is SWFA SSHD 5-20x50 illuminated. It is not as sexy looking, and it does not have zero stop. However, it is a bit better optically and since it has been around for a bit, we know it is a very robust design.
Now, as you go further up in performance, high magnification scopes largely switch to a larger 56mm objective and start going even heavier, so at this stage you should be thinking about that March 3-24x52FFP. Most other options are getting progressively heavier. There is also the newly announced Leupold Mark 5 5-25x56 which is not too heavy, but I do not think anyone has seen it yet (or at least noone willing to talk about it).
With all that, I suggest you decide on how much money you are willing to spend first and then go off of that.
ILya