I have a 14" bar on my top handle saw, an Echo 330T,and it's my most preferred saw of the 3 I own. The other two are 20" and 16" bar.
I've thought about stepping the 330 down to a 12" bar but it pulls the 14" fairly well so I just leave it on.
Thing is, if you get a saw that with a 16" bar, you can usually step down if needed.
So the short answer is "no" not a big difference between a 14 and a 16 bar
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