kenmarable
Hero
Haven't had a chance to play any MC characters yet, but in the past I have generally always been very heavy with the multiclassing - mostly because I like the blended character concepts - but usually did wind up behind the power curve, especially if I was spellcasting (unless we threw together a mystic theurge style workaround). However, the 5e MC rules have really impressed and look like they can support more blended character concepts better than past editions.
One thing I was hesitant about was ability score advancement since it is tied to class levels not character levels. However, after a few minutes with mapping out some actual builds I was surprised that it's not nearly the problem I thought it would be, especially for dual-classed characters. The issue is that with more classes you mutliclass into, the more staggered your ability score/feat advancement is, but personally I see that as a feature and not a bug.
So I don't have specific class advice, but my suggestion is sketch out some rough builds and see for yourself how things map out. There will be a slight power hit in exchange for the increased versatility, but I haven't found any major set backs. The biggest thing might be getting used to the odd pacing of some power jumps (it is obvious with the ability score advancements). You might have to wait just a bit longer to get the boost, but you often get a second boost very quickly behind it. So your power progression is often in fits and starts rather than smooth.
One thing I was hesitant about was ability score advancement since it is tied to class levels not character levels. However, after a few minutes with mapping out some actual builds I was surprised that it's not nearly the problem I thought it would be, especially for dual-classed characters. The issue is that with more classes you mutliclass into, the more staggered your ability score/feat advancement is, but personally I see that as a feature and not a bug.
So I don't have specific class advice, but my suggestion is sketch out some rough builds and see for yourself how things map out. There will be a slight power hit in exchange for the increased versatility, but I haven't found any major set backs. The biggest thing might be getting used to the odd pacing of some power jumps (it is obvious with the ability score advancements). You might have to wait just a bit longer to get the boost, but you often get a second boost very quickly behind it. So your power progression is often in fits and starts rather than smooth.