Best KW research tools?

KW Finder and Long Tail Pro.

Question please to those more experienced in Keyword Research

I have both Keysearch and Market Samurai [paid]. What's the best way to configure my Market Samurai, so as to obtain a type of "Keyword Difficulty" score, like Keysearch does. I know it will be different in both the actual number and the method, but how would I achieve that general type of thing with MS? please.

I suppose my question is, in MS once I've got a list of Keywords, what's the best measure for their respective difficulty?

Thank you.

I've watched a number of Youtube videos on MS, but none really clearly nail it, hence I thought I'd ask here.

kwfinder, ahrefs and semrush are the 3 tools I use.

I find long tail pro as a best option, however it is always good to try couple of tools together to make sure you are targetting the right keywords, and for that i use LTP, keyword finder and also use ahrefs. finding keyword competition is very important.