I think it also helps to take into account the type of music you prefer to play. Some songs definitely sound better with a high g, and some songs sound better with a low g. Plus as itsme and janeray pointed out, if you are a strummer it is really up to your ear's personal preference, but if you decide to fingerpick melodies, the low g is a great addition. For me, when I did mainly strumming, it didn't matter that much, but once I started to fingerpick more, I transitioned over to low g as my "go to uke."
That being said, just my opinion, but if you are just starting out I think you are better off sticking to high g right now. Most of the tabs you find will be for re-entrant "high g" tuning so you will have more materials at your disposal. Plus, it is the traditional "ukey" sound in the high g tuning. I would learn the basics of the instrument before deviating into alternative tunings.
Or as the other posters mentioned, you can always get more than one uke to have one in each tuning.