Surface Pro 3 or 4 for AR 5?

[javafuel]

I've been thinking about upgrade my 4 years old sketch pad, a Samsung Series 7 Slate which has been a fantastic sketch pad. But its resolution is quite low compare to today's 12" Tablet PC. Especially after sketching on a Galaxy Pro 12.2, but AR Android isn't good enough due to the hardware limitations. So I'll most likely eBay it soon.

Since I already have a Cintiq 22HD and and a workstation laptop, so I'm just looking for a sketch pad. A MS refurbished Surface Pro 3 i5 4G is at sweet price point now $450. A used SP4 i5 4GB is around $650. I have the budget for both, obviously saving $200 would be nice. SP3's 256 pressure sensitivity and lack of palm rejection are concerns of mine. Series 7 Slate has 1024 pressure sensitivity from Wacom, I use it with touch screen disabled.

So can you Surface Pro veterans give me the pros and cons? I use SketchBook Pro, PS CS6 and ArtRage 5. Thanks in advance.

[Orkhan]

If is in budget i would go for higher pressure sensitivity.For me switching from 1024 to 2056 pressure level was a big difference, I'm very lighthanded.

[javafuel]

The pressure sensitivity is my main concern, 256 is pretty low and probably would be quite noticeable if one is used to 1024+ devices. I got a refurbished SP4 from Amazon today. Thanks for the input.

[SkyDance]

I have no problems with pressure on my Surface Pro 4, I mean there is no need to apply much pressure, I hardly apply any. but you also can get additional tips for the stylus pen for Surface Pro 4, there is a package of four tips - 2H, H, HB, B you can switch them and see which one you like better