What do you recommend..

There’s no recoil so no worries there. I personally would want a wide FOV when hunting & if 75 yards is your zero, I’d personally go with any 4-6x maybe 10x at most & mil dots if you plan on shooting further.

As far as brands, that’s up to what you want/can spend & if you care about perfect glass, a bit of extra light in dusk or pre dawn conditions.

I think the Hawke AirMax with AMX reticle is my personal favorite under $250.00 scope for my desired needs. 

So many out there. I don’t know your desires in specs. 
 
Depends on size of targets. For large game I like at minimum 2-7 variable with mildot rectical. Small game 4-16 minimum with mildot. Side focus for faster clear shooting picture. I use a 4-16 and a 6-24 most of the time set at 14, and use 24 several times a day for the very small target, like a ground squirrel giving an eye and top of head shot. As to quality of scope depends on budget, I'm into the Hawk scopes for now $400 range and finding them as clear as my centerfire more than twice the dollar scopes.
 
I question the value of those big scopes on a big bore. You won't have a big enough field of view for deer or pig hunting at close range, the assumed purpose of the gun. These airguns are 50-100 yard tools. Here is my Sam Yang with a VX3 1-5x. My .243 and .308 powder burners both have fixed 6x scopes and have both taken deer out to 300 yards. I shoot clay pigeons on the 300 yard berm with both of them at the range.



1553829076_10037603955c9d8cd42354a1.00194269_100_6904.JPG

 
I question the value of those big scopes on a big bore. You won't have a big enough field of view for deer or pig hunting at close range, the assumed purpose of the gun. These airguns are 50-100 yard tools. Here is my Sam Yang with a VX3 1-5x. My .243 and .308 powder burners both have fixed 6x scopes and have both taken deer out to 300 yards. I shoot clay pigeons on the 300 yard berm with both of them at the range.



1553829076_10037603955c9d8cd42354a1.00194269_100_6904.JPG


Good info partner! thanks..