The Reptisuns are more powerful and put out more UVB. So to roughly match a Reptisun 5.0 you'd need a Reptiglo 10.0.
Although, on second thought, I think Reptiglo just revamped their lights so I'm not sure how they match up at this point. I haven't done any comparisons with a Solarmeter nor have I seen any done. But as far as the most recent info I have, the Reptisuns are the better bulbs to buy.