In all honesty- if it's you who are going to be filling that role, then the choice should be 100% yours. If you take bard because of the pressure you're getting from your friends, and end up hating the job, how long do you think the static will last under those circumstances?
I've played both jobs in my static- Bard to 40, and RDM 41+. They were both very busy jobs, but I found myself getting burned out faster playing Bard. I think it's all the running, heh. RDM is my personal choice, because I feel I have more flexibility than with bard- if something happens that needs my attention with RDM, it was easy for me to shift gears. With bard, if I'd just hit a song macro, I was effectively frozen for 6 to 8 seconds before I could react to a potential problem.
Most people prefer bard, because bard offers more for the other players. Post-25 85% of what a bard does is buffing other players- the other 15% is debuffing. As a bard, all you'll be doing is going from one song to another, with an occasional cure or status cure in between. What a bard does is subtle, but effective- they make everyone else work better. However, if you're like me, and prefer to actually see the results of your efforts in more than just XP earned, then you'll prefer RDM.
Above all though, I want to reiterate this point- the choice should be yours and yours alone. Don't give in to pressure and play a job you're only lukewarm on just because your friends want better buffs.
