With her going to the UK, you should be authorized to buy a bunch of each type arrow and run your own exhaustive comparison.
There are two factors to consider -
1) the number of different arrow shafts I am willing to stock . At present I have axis , black eagle vintage, arrow dynamics , ics bowhunters and some no name carbons in stock. The plethora of nocks and inserts is getting troublesome.
2) carrying these from the UK. She can very well carry a dozen or two of one type but more will be an issue. Even then an arrow tube may have to be used as they are unlikely to fit in the check in and unlikely to be allowed in carry on luggage.
I had posted a comparison of the arrow types I had sometime back. Nothing like the accuracy Terry or other folks have done though.