I am a strong supporter of the BoS (atleast the BoS in the Cap Wasteland). Although this topic can definitely not be finalised in a sentence or two, I will try.
I'll probably be punched and harrassed for this view, but I basically believe:
1. BoS actually CARE about the Wastelanders, despite their sometimes laziness and ignorance, and they are definitely the 'good' ones.
2. The Enclave are smarter and definitely more powerful than the weak BoS.
3. The Enclave have the right intentions, but they are ruthless, cruel and evil in the way they go about this.
4. The Enclave's plan is flawed IMO, as after everyone is 'perfect' and non-mutated, they will easily get mutations again, with all the irradiation. Hell, even breathing would almost immediately give you some sort of disease, however small.
So: BoS are good, but quite incompetent when it comes to saving the Capital Wasteland and restoring America. The Enclave are quite capable of restoring America, but are way too cold and merciless in the way they go about things.
I just don't think the Enclave can go around killing everyone in order to save the Capital Wasteland in the longterm. And anyway, as I've said, I think the whole plan is flawed, once they restore America, unless we all want to wear face masks.
And one last thing: I'm a bit tired of all you Enclave supporters flaming us BoS supporters for looking at it in a black and white view. We're both doing it at times, so stop pointing the finger.