''lvl 103'' ''really slow'' ..... uh my man? At lvl 103 the xp travels at just below lightspeed. I'll talk to you when you''re 115+40....
Do inter/minor dungeons, you'll be 115 in no time.
Guardian > Defender PVE and PVP wise. Use sword (dd) and dagger (dd + hp/mp abs)
Defender is cheaper to gear, tankier (50/50 vit/str) and very wanted in partys (emp 7 with monthly free ASES 30% attack force and 45% pdf), if you wanna lvl to 115+20 fast & cheap, get a def.