I also like the VV notcigs buzz pro, though it uses 16340 batteries and has no screen. Other than that, it's very dependable, high performance, excellent customer service. Mine's taken lots of hard falls onto concrete, been used in rainy and snowy conditions, consistently good for 6 ml of vaping at 8 - 10W, 4.5 - 5V, between battery changes. The regulator is rock solid, no sag as the batteries deplete, and it can output slightly higher total power (though a smaller voltage range) than a Provari.
If you have an all day vape, the REO VV Grand is a sweet PV. It does use 18350 batteries (two of them), has the same really solid electronics found in the buzz pro, is a 6ml bottom feed PV (still fine to use with cartos, but it sings with a good atty), again excellent customer service. Again no screen, just a simple thumbwheel to adjust voltage,
I use the VV Grand as my all day weekday device, switch to a carto/tank buzz pro for random outdoor activities, while working building things, snow blowing, etc., where I find the tube form factor a bit more amenable to quickly grab the device, take a puff, stuff it back in a pocket.