It has been said before, but it really cannot be stressed enough; examples of the same model will feel and play differently. You really should try out as many of each to find which one most appeals to you.
I've been informed that the species of Mahogany that Epiphone uses for their body blanks is different from that used by Gibson. The variety of Mahogany Gibson uses is, typically (they vary considerably), quite a bit heavier than that used by Epi., hence the apparent body-weight anomaly.
I've heard of some recent - i.e. Chambered - Standards which weigh more than some (Solid) Re-issues, for example.
P.