A little soon to say IMO. Coming to Europe is a big change for Neymar, who's still very young. Isco is looking the business though.
Definitely not writing Neymar off but at 20 odd million Isco was an absolute bargain.
Also, I kinda felt that Neymar being more of an individual player might perhaps be better suited to Madrid whilst Isco could slot into the Barca style with greater ease.
It'll be very interesting to see how Neymar does over the next couple seasons. Hopefully he gives them another dimension to their (now a little tired) tiki-taka and they give him a more stable environment (than Madrid) to develop in.