in general, hub goodness relates only to durability. none of them are appreciably different in how fast they are under load. like not even 1 watt.
weight doesn’t matter much either. a lot of people think that wheel weight matters more than say, frame weight, but it really doesn’t, in fact is matters a bit LESS for triathlon purposes.
so keep that in mind
durability, and cost would be the only factors to look at for a training wheel. The shop you are working with should have a good idea on how often wheels they sell come back, so if you trust them to be honest with ya, thats useful info. (im pretty sure they sold me a too small tri bike years ago because they had it in stock though, fuckers)
if you want to double them up as race wheels, well a cover for the rear wheel makes any ole rear wheel as good as any disc wheel
I’m a bit of a wheel hound. I have some Ksyrium SSC SLs (25,000 miles) and some Easton EA90TTs (and 6 other sets 
The Ksyriums are likely more durable - hard to kill and well proven as sold by the millions. The Eastons are a “faster” wheel (lower spoke count and semi-aero wheels), but less durable hub (per reports). Can be had for a lot less.
The neuvations are very nice for the money, but not as nice as below:
If spending close to 1K, I’d highly recommend the new Dura Ace WH “carbon” (alumin with carbon bonding) wheel. SUPER nice hub, light, durable and stiff. A much better training wheel for that money if not building one (i.e. King hubs, open pro rim, etc. which you will certainly get some recs for).
well, i’d like to keep it simple as in between only mavic and the eastons’s althoug i thank you for your input with the nuevations Mr. Mott. what i was told is that the threaded spokes into the rim on the sl’s can become fused and so the spokes can break. not that big of a deal unless it tears into my carbon fiber stays, that could not be so good. the eastons have the normal spokes and i was told that yes, they are faster than the mavics but is that treally true? is it only beacuse they are semi aero or is it the weight as well or the hub? and the hubs now used by easton are their own as is the same with the mavics. the mavics are easily servicable but i don’t know about the eastons at all.
now mind you that the kind of riding im about to put down is the ironman type of riding and i’d like something that i can use on the road and in the tri’s. i’m not rich, i can barely afford to eat let alone have a different set of wheels for different occassions so i’m searching for a best all around wheelset, dependable.
so with that said would you all say that the mavics, tried and true, are the best bet? any problems with those spokes breaking?
thanks for all the help peeps.