Not really comparing apples with apples there. The PoScope is a combined scope/logic analyser whereas the the Ant8 is a logic analyser only.

The Ant8 has less channels yes, but also has a 500MHz sample rate compared with 8MHz on the PoScope.

Do you want/need a scope, an analyser or both? Or are you looking for a logic analyser and the PC scope would be "nice to have"

Even 8MHz on the PoScope isn't exactly fast (i.e. only a 4MHz signal can be captured and then it's nice to have much more overhead to capture issues like when setup and hold times aren't being obeyed).

8 channels is limiting though on the Ant8 if you want to put address and data buses into it. Fine for things like SPI, I2C etc though.