I think that a 2 Seater is seen to be more of a sports car as the Healey's, MG's, etc. were 2 seaters and they are really just for the driver. Needing the seats in the back is admitting that you are either now no longer young (have kids) or not old enough (not an empty nester). I have to admit that I bought a 2+2 the first time so I could put the kids in the back
To my eye the proportions of the 2+2 are better and if you could get it with the same roof line as the 2 seater I would say it would look better. More the proportions of a E Type.
When looking to get back into a Zed I was hell bent on a 2 seater but more for retaining its value than anything else. Its amazing that you can buy the same mechanic spec of a 2+2 for less than $10k that you would pay $25k for a 2 Seater.
I love them both, happy to own either