GnR & VH are similar in style and attitude, and that gave a lot of people fits trying to decide in that poll which was a better debut.
Boston kept the same high quality slick production of their debut album throughout their career.
VH had a rougher edge at the start, did some morphing with a smoother, fuller sound as the band evolved.
Boston's debut is far more polished than VH's. Not saying it's better, just different.
I went with Boston, for no better reason than I took Van Halen over GnR in the other poll.