I have the 2018 11 and I actually prefer it to the newer models just because the camera is smaller and therefore doesn't rock on a table (first world problems eh?
🙂 )
The processor (A12X vs Z) only has slightly better CPU and an extra GPU core, so you won't see any real world difference.
The only thing I'd be careful with is the storage as
@jazz1 says - is 64GB enough? I got the 256GB mainly because I download a lot of Netflix shows for on the go, and have a lot of playlists downloaded in Apple Music - something that I don't have to worry about on my phone as it has an internet connection.