I'd go with the six pack, it's probably cheaper and it will build a better foundation, going from 6pack to glass is no biggie, other way around not so much,
Also if I were in the poll, I'd vote for a grumman AA1 or C150 6 pack, you dont need a fancy plane, it's all procedures, the flying is not a big issue.
Go for cheap and basic, better for building skills and easier on the wallet.