Daemos blackclaw
As the member of my group of friends who is usually the DM, I have to say I prefer person to person, and baring that, a real time or near real time software that includes a battle-grid. often times players (and the DM) miss out on unique tactical scenarios, because you simple cant visualize the battle perfectly in your mind. its not unfair per say, as both sides are equally handicapped, but the game does loose something in combat.
as to the RP side, while its true that PbP is often, lets use the term "juicier", for beginner players (as they have the luxury of refining their responses), veteran players and DMs can turn an in person game into amateur theatre - often with fun and interesting results.
as an example: had a player give his dragonborn a cockney accent, but Rastafarian Vocabulary (because they have dreadlocks) ... as far as our gaming group is concerned, thats how dragonborn speak in general in our campaign world now ( .. .. the wierd rasta words must be smatterings of draconic!). that is not something that can be experienced via PbP.
Dreadlocks, thick scales with rope-like consistency... to-may-to, to-mah-to... but the thought of a cockney/Rastafarian cross makes me LOL.
blaugh
I completely agree with the battle-grid requirement - I consider myself a tactical type of person, and being able to plot, aim, and execute maneuvers is one of the things I enjoy about D&D. Another aspect I like is the witty banter (and occasional rampant silliness).
Case in point...
DM: "This appears to be a library. There is a corpse here with a fallen bookshelf on top of him."
Player 1: "I search the body - what's on him?"
Player 2: "BOOKS!"
blaugh