I use a combination of three apps for drawing:
- Adobe Sketch (personally, it gives me the closest feel to a pencil)
- Paper by 53 (another great app for sketches and watercolor - great to sketch out quick ideas - it's also a very fun app)
- Sketchbook (this is the one I use for my detailed work)
I often start a sketch in Adobe Sketch and finish it in Sketchbook. I love the combination of drawing apps!
Drawing outside on the 12.9 Pro is a mixed bag for me. In the sun, it's not very usable. In the shade, it's pretty great! As long as you can find some nice shade to draw in (or draw outside on a cloud day) it should work well!
As for the Adonit Pixel... I'd stay away from it. The ONLY devices it works close to advertised on is the iPad Pro (and you have the Pencil on the Pro which is WAY better). I bought it hoping to be able to make my Mini 4 into a pocket sketchbook, but it doesn't work good enough to be even just a sketchbook (latency and parallex).
Good luck and enjoy! Drawing on the iPad Pro is by far the most enjoyable drawing experience I have had! I'm actually considering replacing my iPad Air with the 9.7" iPad Pro (I have the 12.9" but it's not the most portable...).
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I seem to recall that the Apple Pencil was best in class when it came out, and that there was no comparison to current 3rd party pencils for previous models. I suggest you find an Apple retailer and see if you can try out the pencil there.
For iPads, there's just no compairison. If you don't have a Pro, Pencil by 53 is probably the closest to being any good.
On other devices, the Surface Pen for the Surface pro 4 (which also works on the Pro 3) is pretty great! They did a great job improving on the original Surface pro 3 stylus.
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You can buy a third party stylus for drawing on the Air 2. The problem is that to get a fine point and pressure sensitivity you need a Bluetooth stylus and other than the Adonit Pixel they mostly don't work properly on the air 2 because of changes in the screen technology from earlier models.
You could buy an app like Procreate and a dumb stylus to play with. That would give you an idea of what it's like to draw on the iPad screen without investing a large amount of money. If you enjoy drawing on the air 2 you'll love drawing on the iPad Pro with the Apple Pencil.
I don't know... The experience of drawing on an iPad Pro with an Apple Pencil is pretty far and away from any other iPad/Stylus combination. Even the best combo on the Air 2 can't hold a candle to drawing with Apple Pencil on the Pro (either size).