BW, as you can see, there are lots of good, hard mechanical and money reasons on both sides for going with either the VW or Suby motor. You could probably load all of those facts into the right algorithm and come up with the definitive answer for which one makes more sense.
The problem is that nothing about this hobby is based on cold, hard facts, logic, or common sense. It's really more about what puts the biggest grin on your face.
I think most of us start with the notion that if we're going old school, we need to do it right - somehow, these half-baked, plastic recreations aren't 'right' without that poketa-poketa and whirring fan out back. And those of us who can remember the sixties are maybe also pushed that way because we have this vague memory that VW motors are cheap and easy to maintain, and dead-nuts reliable.
Well, a lot has changed in 50 years. VW motors are no longer cheap and our standard of what's 'reliable' has been rocked by modern fuel-injected and computer-managed engines.
Truth is, with a dual-carb, high-performance air-cooled Type 1, you will be fussing a lot to keep it dialed in - by today's standards. Some of us still think this is 'fun', some of us get bored with it in time and move on - either to Suby power, or to Boxsters, Miatas, or to straight jackets and little, padded rooms.
You're really the only one who can decide which way to go. No one can tell you which is better - for you. And sadly, you just have to drive a VW motor for a while and put up with its quirks to really understand it. While trying to decide, you should be driving as many of these cars as you can to get a taste of what lies ahead.
As we sometimes say here, it's all about the journey.