What particular line weight are you looking at? I’ve found the action of the XP tends to vary throughout the range. The 5 weight is Thor’s Hammer but I’m not particularly fond of the 6 weight. The higher line weights (7 and up) tend to get disproportionately faster than the lower line weights.
I’ve only fished with the GLX in an 8 weight, so I can’t offer much insight on that series.