I have both. Of you're asking this, eventually you will too...lol
In all honesty it comes down to what you want. My reo is bomb proof and hits like a beast, but building the coil is a law of averages, where I try and build it based on 3.9 volt wattage as it starts at 4.2 a little harsh, and ends at 3.7 being a little too light. Nothing like dripping though, and it carries well.
The provari is also bomb proof and super consistent, but you're not able to drip. And can be accused of trying to commit Jedi suicide...lol. That said, I have a pro tank 2 on it now, and I'm absolutely blown away by the results. It had been relegated to the spares bin because it would either dry hit, flood or burn. Something about the provari makes it work like a champ.
My best advice is to find someone with both and try them. Opinions run hot for both devices, and right now you're standing in the mason Dixon asking if you should join the union or confederacy...lol
Good luck!
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