[ubuntu] laptop with hybrid graphics - nvidia or ati?

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http://ubuntuforums.org – hi there. i am going to buy a new laptop with an intel i7 cpu and a discrete video. and as far as i understood, there is no way to find high-performance laptop without this troublesome hybrid graphic feature =( the question is - what is more problematic, nvidia or ati card? as i understand, i will need to turn off discrete card to work in normal way, and turn it on (using Bumblebee/Ironhide for nvidia; vga switcheroo for ati) when i need play game/whatever else anyone who has an expirience with this, can you advice me? at first i wanted to buy smth with gt540m, after googling a bit i've know (Hardware)