So im looking to get a new 13.5t for stock buggy and I really like my current muchmore fleta v1 motor.

But I would like something more updated. Is the Muchmore Fleta V2 Sting 13.5t worth it or should I pick something else?

Over here the "sting" series motors are considered "outlaw" motors, so you might want to be careful, depending under what rules you race. The Muchmore V2s are certainly among the better mass-market motors, but can probably not quite match the 150$ motor of the month brands popular in the US.