The K301 is far brighter than the K90. That's a huge plus.
But realistically, it's all up to what you think is better, not what the rest of us think is better.
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LOOKING FOR THE FAQ? IT'S HERE.
You never found that link, did you? Why? It's hard to find in the NavBar across the top of the forums, amongst a lot of other crap.
TELL MP3CAR YOU WANT A LINK TO THE FAQ IN A MORE OBVIOUS, NOTICABLE LOCATION HERE.
I've been e-mailing the manufacturer back and forth for a while now, and here is what she said about the K300 versus the K301:
K301 and K300 are same in function. K300 is base from K301. K300 's button is lower than K301's on front case. K300 and K301 are also defference on front case design. K300 is more easy for your hand pressing.that is all.