Rat 7 has a little more heft for chopping. You may need to sharpen it a few times to break through the crappy factory edge. Great beater knife.
Esee 6 is more refined, better fit / finish - thinner behind the edge but probably stronger in a few areas than Rat 7 ( specifically in heat treatment ).
Esee May have better warranty though both claim lifetime warranty.
I’d spent the extra $30 ish and get the 6 if I had to choose. Esee comes with a better sheath you won’t need to replace in 3 weeks.
Watch the exchange and grab a user, Esee 6 pop up very often.
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Great knife. Worth the average price. Easy to keep sharp, takes a beating, can do most things a knife should do - still cuts pretty well.