I guess this is like the old "Mac vs. PC" wars - each person has their own preferences and likes/dislikes. I happen to like the size, simplicity, etc. of an iPad with unrealBook for me ... sure a laptop can do way more, but for what I use the iPad for, it does all I need (call up PDFs, search for songs, use Set Lists, send MIDI to call up Tyros registrations, etc. - and, I can network several iPads (4 in my band) to all work together when calling up songs. A Laptop can likely do all this and more since it's a full-fledge computer, but for me an iPad does what I need, very well.
I can see both sides - some prefer a laptop and it works great for them ... glad we have a choice, we can do it whatever way works best for (each person)! :-)
Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys