I'm not playing Resurrection but one of the defining "features" of GregTech is how almost anything you did previously in another mod will become harder, take more time, and consume more materials.
So the answer to your question is - if you can make something without GT, then you do it. Period. Make it your default response, and you will almost never be wrong.
They call it GregTech, but I submit that S&M Tech might have been a better name for it. LOL If you don't get my joke, just forget it. I actually LOVE GregTech and can't play any modpack that doesn't have it installed anymore.
Just for example, I received advice on the forums the other day... it said something like "GT Steam Boiler is extremely inefficient and thus you should use the Railcraft Steam Boilers until you reach the GT Nichrome stage" (end game). That same advice literally applies to anything with the Greg.