Curious to the opinions, which and why.
Low g offers you a deeper, more guitar-like sound with a bigger range. High g gives you that traditional uke-y sound, but with less range. It all depends on what you're looking for.
The only problem I have with low G is to find the right string as it can typically be overpowering. I've tried 4 difft sets of Worth Tenor Low G (Two Browns and Two Clears) and hated all of them. Of course it could be difft with your uke.