Quite frankly, neither is a laptop replacement, so unless someone is a member of the ACTUAL Creative niche buyerrs, a new iPad MINI besides the Air would probably deliver as much value for a lot more people than this article considers.
Outside the certifiable Creatives, the rest are prestige and conspicuous consumption buys for non-professionals, Look'it Me hardware in search of an actual need.
I'll save my $$$$ for an iPhone upgrade, where the additional power is actually IMMEDIATELY meaningful even for a slightly above average user.