I recently went through this same decision making process, but with one more variable - Solex, Weber DCD, or Weber DGV. After trolling through the 750/101 board and talking to some smart people I decided on the DCD. Here's my take on the pros / cons of each.
DGV:
Pro - more power, relatively inexpensive, easily available, lots of sources for parts
Con - a bit too modern looking, probably OK for a 1300 but somewhat tall for a 1600, need to use an ugly aftermarket air cleaner
DCD:
Pro - more power, period correct, tuning parts still available, can be used with the OEM air cleaner (with a hard to find adapter)
Con - hard to find used, expensive new, a bit taller than stock but not as bad as a DGV. With the adapter it's about 3/4" taller than the original 1300 Solex.
Solex:
Pro - original, no fitment issues, good MPG when running well
Con - 50+ years of frustration getting these to run well, tuning parts are NLA, down on power compared to the Webers
I'm sure others will chime in with their input. Here's a pic of my DCD, along with some other goodies for the new engine.
-Jason