I just repost what I wrote on unofficial discord just yesterday…
We use both, musky and bard, what is best depends on bosses and also who is playing them and how he’s geared… the advantage of bard is the constant broad AoE group heal, no need to aim heals and it contributes more dmg than muskys do, normally, too (but not necessarily; musky weaknesss orb can be powerful, boosting the whole group). The downsite is Bards got no shield and cds to build up tankheals can be (too) long, musky got more chances to aid with oh f…-situations in a row and deal with heavy dmg-income or badly geared tanks.
The musky needs to mainly practice his aiming, while the bard needs practice his movement while still hitting all notes and also needs to manage when to release his bigger heals and when not to.