Best .22 pellets?

There’s no best pellets for the brand and model of airgun. There is only best pellets for the specific barrel. Try as many pellets as you can. Recommend to start with JSB. 

Try RWS meisterkugein grain wadcutters and H&N field target trophy grain 14.6 grain 5.5 head size. H&N offers sample packs and that's good for testing several types of pellets. My 10x gen2 loves the RWS wads. Good luck and have fun.

Accuracy testing with several types of pellets is the only way you will determine what will shoot best in your rifle. From my limited experience with these rifles, they shoot too "hot", too high of a velocity. The heavier pellets will likely do better, 18 grain and heavier.....

Try the newer Crosman 19 grain pellets. I have shot them in a couple pcp rifles and they out shoot JSB in both rifles.

Bob in WV

The most accurate pellet I found for my Gamo Whisper fusion Mach1 is the JSB diablo 14.35 grain pellet. The H and N FTT 5.53 head is next but the barrel fouls quickly so before you buy a bunch of a certain pellet make sure you shoot enough to determine how many shots you can get before you have to clean. Mine will shoot Crosman 14.3 gr. ok but you will get some undersize and they will be fliers. 

start with a QUALITY name brand and work from there.

most of my rifles show a preference for H&N, JSB or Crosman

If its a brand new rifle, I'd recommend something cheap to use while breaking in the rifle and just don't expect much till after break in.