Oh this wonderful debate, again. tripples are heavy. compacts are a compromise in gearing made for vanity. whatever.
Tripples are heavier than a standard double , the weight of the 30 ring, the mounting bosses on the crank arm, the extra material it takes to make the rear derailer cage about an inch longer, and, maybe two links of chain. thats maybe 6 or 8 ounces.
compacts have a larger cassette with bigger steps in between gears and a shorter top end at 50/11 .
some people prefer one and otheres prefer the other. its a personal choice.