IMHO
It's much easier using an engine leveler and pulling both out. Remove radiator.

One time I didn't have a leveler, was operating in a shop with limited ceiling space. Raised the rear up slightly and when angling the engine out, removed the front wheels, supported the front end on a floor jack and lowered the front as close to the ground as possible - just had enough room.

Lying on your back getting the transmission off while everything is still in the car is no fun.
If you have a hoist obviously disconnecting the transmission left in the car is easier.