Best immersion blender?

Decor Similar has recently done a review about best immersion blenders 2020: https://decorsimilar.com/best-immersion-blenders/

I think you should checkout them for the best review out there. And Recently I've Bought Green Blender according to their review, guess what I'm very much satisfied with the product.

Serious Eats does periodic equipment reviews. Fortunately, they did one recently (November 2017) for immersion blenders:

https://www.seriouseats.com/2017/11/best-immersion-blenders.html

I find their equipment reviews to be reasonably credible, more so than random endorsements by anonymous Q&A forum participants since the latter don't do detailed comparisons of multiple products.

It would be prudent to compare the Serious Eats reviews with Amazon.com community ratings. I wouldn't settle for anything that didn't have 4.5 (or maybe 4) stars. Pay attention to the negative comments, they are typically more detailed than the useless "I love mine!!!!!" thumbs up comments.

I have used the Serious Eats reviews a few times for product purchase decisions, including my cheapo gas grill which faithfully functions in the manner described by Serious Eats.

Anyhow, best of luck with your purchase.