First off close-micing electric guitars is strange. Both the speaker and the mic have proximity and positioning effects. That said, IMO for a close micing dynamic you want one that has some hype but not a huge amount.
The RE-20 has almost no hype. The Chinese-made SM57 has a shit ton. IMO you want something in the middle, which all the ones I suggest fall in that camp. The M88 is probably what I use most often but the e906 is cheaper and very good.
The proximity effect cancelation of the RE-20 is not super useful on guitar since you can create an artificial bass roll-off by moving towards the cone center. So the biggest selling point of the RE-20 is not IMO particularly helpful there.
The RE-20 fits a lot of spoken word stuff, is GOAT on horns and string bass and good on electric bass, kick drum, and many things you might use a condenser on. I own 2 and use them frequently. Just not for guitar.