Quote Originally Posted by Leewei View Post
Beguiler 20:
- Larger spell list.
- Ignore SR on opponents denied dexterity bonus.
- +2 DC on spells cast on opponents denied dexterity bonus.
- Glibness spell access for a +30 bonus to Bluff.
- Silence and zone of silence for general sneakiness.
- Int+6 skill ranks per level with an Int casting stat, resulting in a very strong role as skill monkey.
- Bonus feats of Still Spell and Silent Spell.
- Able to cast in light armor.
- d6 HD; expect 19 HP more than Rogue / Sorcerer build.

Rogue 1/Sorcerer 19:
- 1d6 Sneak Attack damage.
- Smaller personal list (two 9th level spells known).
- Greater flexibility in spell selection, including limited wish and wish.
- Loss of one caster level.
- Two fewer level 9 spells per day.
- Familiar.
- Int+2 skill ranks per level (Int+8 x4 assuming 1st level Rogue).


Leaving the notion of which is a better build aside, these two have fairly different capabilities. In general, the Beguiler will be far better at being sneaky, and will get far more benefit from it than the Sorcerogue.
but to be fair tothe sorc rogue he could go into a few good prcs like spellwarp sniper, arcane trickster and/or unseen seer.