Both, if there's room in your budget and life for two ukes. If not, I'd go with reentrant/high for the sake of variety over the linear tuning of guitar.
For finger-picking, I used to think Low G was best, but lately I've been doing a lot of finger-style on the re-enrant uke. Try this one, Pete Seeger's Living In The Country on a high G. This arrangement just doesn't work on a low G uke.
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Can't it be re-worked for low-G?