My wife had a '63, I had a '65 and we had a '71 Type 1. Liked the '71 well enough I got a type 2 also. Later had a GTI.
The pre-"68 bugs drive and ride like a go cart... the '68-'71 ride more like a go cart on steroids.
My impression is if you are driving it and not investing in it you should stay '68 or later... 12V. I would recommend '68-'71. Our '71 was the standard beetle, they introduced the super in '71 and I think the '72 on were all supers. You can always tell a super beetle, it's the one with the fat, ugly nose.
The reason I like the '71 is that is the last year with the single carburetor. After '71 they went to dual carbys and then injection... then added on all sorts of smog stuff and computers. The '71 is easy and inexpensive to maintain and is very reliable. I found that friends with later stuff had lots of problems which I avoided by staying with the '71.
For my money I would grab the '71 instead of the '72 unless that '72 cost at least 75% less than the '71. You will make up the difference in purchase price quickly in lower maintenance costs on the '71 IMHO.