I have experience with both. GXP is a great phone for its low price and it has all the features of the IP phones. It doesn't have any considerable issues with it. On the other hand Linksys 921 is superior in voice quality, look, and TFTP support but limited in features, like limited line appearances, no PoE or inline ethernet, and many other software features.
In my opinion, where you have busy environment and high usage of phones, use GXP-2000 phones. For a few executive desks where there is not much call volume, use Linksys.
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