I like both but can't say that either has a great deal of spin around the green. Both are known for limiting spin on a drive but with adequate distance.
Best solution is to buy a sleeve of each and give them a go. I prefer the E6 but probably play the Calloway more often.
Another to try is the Srixon Q-Star, very similar ball.
I played the Royal Gems course just East of Bangkok this week,we've talked about it for a couple of years but finally got round to it.
It's a replica course with the back 9 of Augusta and,among others,holes from Troon,St Andrews,Sawgrass,Oakmont and the Belfry on the front 9.
The Postage Stamp.
Oakmont No 3.
8th at Bethpage Black.
The Entrance and Clubhouse.
A good day.the likeness of holes are very impressive.The course is still very young,only 4 years and once all the trees mature it will look even more like the originals.
Cost was around 125dollars including cart and caddy.