I have cibie's in my TJ and Hella E codes in my XJ. The cibie's give better light but I think mainly that is a product of quality and a round reflector. The construction difference between the cibie and the hell housings are very different, the cibie's are heavier but thats from all the metal and glass vs the plastics that are used in the current lights, the hellas and others I have looked at are plastic pretty much. I also have a couple of pairs of CIBIE super oscars that were built back in the 70's and those also are heavy for their size but their light output is amazing, I fried the readers at a NJ state inspection station when they had me put my highbeams on and they were still switched to go on with the high beams, pegged the meters and they did not come back down, I failed.
The other thing you might want to try first is check the voltage going to your stock lights, if it is below 12v you might want to consider building and adding an auxiliary harness right off the battery to the lights, fairly simple to build with 10ga wire, couple of relays, two headlight sockets and a male 3 prong H4 type plug, you should get about 13V.