Got back from Borovets over a week ago and had a great time. Our group was a mixture of snowboarding abilities (newbies like me to some that have been boarding for years) and everyone thoroughly enjoyed themselves.
Two of our group had been to pamps the year before and said that they preferred borovets as there were more choices of runs and it was bigger.
Can't comment on the rest but we love Borovets, the atmosphere, the friendliness, the pistes, the layout, the apres ski, the food .............all great Bring it on
If your not experienced try Boro. Pamps has only one green run which gets congested when everyone is learning on it. If you can ski well, the reds and blacks were very really busy. Boro has 2 seperate ski areas so the slopes dont get as busy. Hop this helps.