Hello janderson and welcome to the ArtRage forums
Only you can really say which features would make AR6 a must have for you.
For me I’ve always eagerly upgraded to every new version. Not just for any new features but for the bug fixes too!
The Mac version of AR6 is better optimised for Retina screens now, which as a Mac user I found definitely sped up screen render times when zooming and panning the canvas around.
I have always loved the Watercolour brush and in AR6 it is slightly faster and slightly larger at 500%, than in AR4. And I do mean only slightly bigger and faster but every little helps!
The Warp filter tool is a life saver for nudging paint around to where you really wanted it in the first place!
The new Custom Brush will let you switch between painting and erasing with the same brush.
The oil brush now has controls for paint Depth and Gloss added to it.
And then the…
Well I could keep going but the things I’m liking might not be of any interest for your painting style.
So here there is a page where you can compare all of AR6 to other past versions: https://www.artrage.com/product-comparison/
And if you are still in doubt, why not try it out! You can get the demo version of AR6 here which is a completely separate instal and won’t interffear with your current copy: https://www.artrage.com/demos/
And finally and most importantly as an existing owner of a full desktop version of ArtRage you are eligible for a 50% upgrade discount at any time! See here for more details: https://www.artrage.com/upgrades/
Maker Of Replica Macoys
Techie Stuff:
ArtRage 6.1.1 ~ 15" Macbook Pro ~ macOS 10.14.6 ~ 4 Core i7 3.1GHz CPU ~ 16GB RAM ~ Wacom Intuos4 M