ipad or android tablet for an artist??

[Minitoots]

I want to get my Dad an ipad or android tablet for his 90th birthday - he's already got a laptop and is only interested in it for the drawing and painting apps. I use 'brushes' on my iphone which is great but wondered if anyone knows much about the drawing apps for android tablets such as 'Sketchbook pro' etc. I'd go for an ipad straight away if it wasn't for the higher price, so if another tablet would do a similar job, it'd be good to hear about it.

He would need to use apps which are user friendly and not too complicated for an oldie....

Also if anyone is selling an old second hand one I'd be very interested to hear from you!

[Minitoots]

Is 'sketchbook pro' fairly easy to use? He's familiar with very basic photoshop on his laptop already....