Each has it's perks I think. IC2 + GT can keep the player from getting an ungodly amount of resources in a short time of playing. TE has nice upgrades, and I like the RF power system more than EU. If you want to give the players of your modpack a fresh experience, have them use EnderIO instead of TE. Take out mods that throw the balance off, like Big Reactors (or change the recipes to steel).