Browning`
Funny thing is that I purchased it solely on how it small it was.. Then after shooting it over 1000 rounds, I can honestly tell you I love it. Accurate and mostly never jams. Tried a variety of brands and the only issues I had they were with the Remington golden crap. I had problems with my Sig .22 as well with that ammo. Every single round was a jam...
Back to the Browning, when I bought it, I also handled the GSG and was not impressed with it.
The only concern I have with the Colts from Umarex is with their frames made of zinc. Same pot metal they use on their blank guns and from former experience with them, no thanks. Same issue with the Walther P22. Zinc cast. Honestly, with how much they charge, they should use at least aluminium. Zinc, pot metal, or their own alloy as they call it, I do not trust nor I will ever buy a gun made of it.