call to arms multiplies the xp you get by a shit ton. Normally, an AB win would give me something like 3-5% of a level at 50-60. Call to Arms AB weekend, I was gaining about 1/3-1/2 of a level per win.
A metric fuckton of xp regardless of level last time I checked, 10% per SotA win on my 70-79 warrior was good fun. even better if it's the call to arms.