It's predictable that at Trekmovie.com and here people like Uhura's earpiece best - not because it looks particularly good or sensible or anything, but simply because it looks like what we've already seen in TOS.
It's round and made of metal and all shiny--that's why we (I) like it.
I'm sorry, but that communicator looks like a brick. I'm getting TWOK flashbacks. Though I'll grant that that may be more realistic for military field equipment...