Depends on what you would do more of. if you was to do TT more I'd go for the deep section, if your racing more I'd go for the lighter of the wheels, but again depends on what sort of racing, if it's road go for the deep rims, if its crits I'd go for the lighter ones. What I'm trying to say is it depends on the type of course you'd be riding.
Lighter wheels are great advantage on hillier courses but the deep rims are great for flat out speed.