I agree. Both can have their pros and cons.
Coven life has the potential to be a wonderful thing, if the coven is a good one. It has the potential to be like a family, with the newer members learning from the (hopefully) wiser ones. However, just like any other group, there is always room for immaturity, power struggles, squabbling, shirking of duities...I could go on for days, really. I personally would love to be part of a coven, but that blessing hasn't been bestowed upon me. I do have a friend who states she is interested in learning from me and forming a group, but I don't know that she is really that serious, which is frustrating. I take my religion very seriously and would be highly offronted if I spent hours and hours in preparation for teaching and my neophyte didn't show up or want to pay attention. I can imagine that if you enjoy the other coven members, and you get along well, then everything could be peachy. However, I can also see that coven life could be a drugery or burden, taking all the joy out of the practice.
On the other hand, being a solitary can be a wonderful thing. You get to choose what rituals to do, when to do them (well, mostly, ha), what spells to do, etc. You don't have to work around everyone in the coven's schedules or deal with lazy or unmovtivated members. You can grow and learn at your own pace, or even go AWOL for a month or two with no one being the wiser. However, again, there's always a dark side. Solitary practice (as I know) can be very lonely. You have no sounding board, no one to prod you when you've grown stagnant, no one to just simply enjoy the awesomeness of being witchy. No one to poke you and say, "Hey, is that really a good idea?" when you get it in your head to do that love spell.
Personally, I am a solitary by necessity, but I have dreamy fantasies of a wonderful coven-family...probably very unrealistic ones, ha.