I own an AAC Scarab (same as the Pilot, but with a stainless steel tube instead of aluminum), an SWR integral suppressor .22 Ruger pistol, and an AWC MK9 for my Uzi subgun. My frequent shooting partner has an AAC Tactical .45 suppressor for his HK USP. Having experience with all these, I'd say go with the AAC Pilot.
If you are like most folks, the majority of your shooting time is spent plinking or target shooting - situations where power of the cartridge is of little consequence. Centerfire pistols are fun to shoot with silencers, but the cost is always higher than with a rimfire. Additionally, the .22 silencer is quieter than a centerfire pistol silencer of comparable quality.
The Pilot will be a very enjoyable item for you. You will probably end up shooting a lot more rounds than in the past because of the lesser annoyance to others and the lesser annoyance to yourself of time spent wearing earplugs or earmuffs. I've shot my P22 with the Scarab and it is an awful lot of fun. I use it even more on my CZ452. It is so wonderfully quiet on the rifle that it keeps my shooting from being bothering others nearby.
As for shooting through a 9mm can, it is true that it is an option. The main problem is the size of the suppressor in relation to the smaller arms designed in .22 caliber. It is a clumsy combination and the suppression is normally not as good as with a suppressor designed for .22s.