The TT350 is an older model, the one I meant as the weaker alternative is this one: https://www.bhphotov...n.html/overview
The V860ii has a zoom reflector that goes to 200 mm, the V350 and TT350 only goes to 105 mm. The GN is 196 for the V860ii, 118 for the V350 and TT350. There is no problem using a longer lens than the reflector setting.
TTL means that the flash can use the camera's light meter and communicate fully with the camera. All three support HSS as well as i-TTL. i-TTL is a refinement on TTL that fires a weak pre-flash for more precise metering.
The Ving models both have rechargeable power packs, the TT350 uses AA batteries. All three are compatible with the Godox wireless radio remote system so you will only need a transmitter the day you want to get the flash off the camera.
Auto-ISO with flash isn't the best idea as you want control of as many parameters as possible for consistently good results.