Both the Rogue and the STR glaive can level just fine on their own. I own a level 49 rogue/cleric, a level 60 rogue/bard and a level 59 full STR glaive.
The rogue/bard is skilled with Xbow only. I didn't farm the account, I just wanted leveling speed, and I got it. Moving march and noise are great for leveling with Crossbow Extreme on.
A rogue/cleric requires more skill to play and level effectively, but it can tank much more than a rogue/bard with Recovery Division and Bless Spell. My rogue/cleric is skilled both in daggers and xbow, making up for great diversity both in leveling, job wars and PvP. The rogue has massive criticals and is basically a 1-shot/hit-kill build. The downside is, that with Dagger Desperate or Crossbow Extreme activated, the defense and the HP drop massively (HP only drops with Xbow extreme). A rogue can also be handy in a party, as a secondary damage dealer (the damage isn't as good as that of a wizard) or, alternatively, as a lurer. Fast shot has an amazing range increase, which helpts alot with luring mobs.
The full STR glaive, on the other hand, has proven in time to be one of the most stable builds there is. The full STR glaive has been one of the dominant builds since like... forever.

It's got massive HP, good criticals, and great tanking ability against magical attacks (with the fan storm series). The build has few flaws, and geared (and skilled right) can be deadly. The glaive tanks well through stuns and knockbacks, but i doesn't have the extra defense a blader has (through the shield), nor does it have the bow's ranged knockback.
Here are three videos, showing the potential of each build.
STR Glaive:
http://youtube.com/watch?v=Q6NCBHdlCHoRogue/Cleric:
http://youtube.com/watch?v=eWAmhiqBEjIRogue/Bard:
http://youtube.com/watch?v=b-fhB-bzPK8Hope this helps.
