Pure str fire/light blade. Fire for the damage, light for the great buffs it offers such as grasswalk/phantomwalk, concentation, and flow piercing.
I have a 53 fire/light pure str blader on Alexander, and I can usually pvp the 60-63 and still hang with.
Make sure you run at least a block ratio 16 shield ,crit 8+ on the blade with a high phys +%, use knock down attacks in pvp with the stabs, and use chains seldom. Blade wins pvp by knocking down
By the way, there is no "better" build. If you want a great tanker, then go with a blade/shield. If you want someone who can deal a whole mess of damage, go with a glavie.