I started out ages ago with Tekkit and in that much older version you don't have much of the goodies the current FTB pack has. It's mainly missing Thermal Expansion. I started out with Buildcraft and later on moved to IC2. I liked the IC2 power system much more because you could actually store power. Standard buildcraft engines and conductive pipes just waste any power not being consumed. When I found out about Thermal Expansion I more or less compeltely moved from generating EU to generating MJ (buildcraft) because it's simply more convenient.
It all boils down to personal preferences though but I would really recommend you look into BC power. Coupled with TE energy conduits and REcells it's very easy to set up a nice powergrid. And for transforming that to EU for your IC2 machines you can get a nice 1:1 conversion by smelting cobble into lava and then fueling a Geothermal Generator with that. That's much more efficient than the 6EU you need to generate 2MJ in an electric engine.
It all boils down to personal preferences though but I would really recommend you look into BC power. Coupled with TE energy conduits and REcells it's very easy to set up a nice powergrid. And for transforming that to EU for your IC2 machines you can get a nice 1:1 conversion by smelting cobble into lava and then fueling a Geothermal Generator with that. That's much more efficient than the 6EU you need to generate 2MJ in an electric engine.