Another alternative you might consider, which costs a lot less, is to get a tall desk and tall drafting chair that you can hop in and out of.
I hacked an IKEA desk so that it’s exactly the right height for me to stand at, then got a drafting chair (as nice as most office chairs, and on wheels, but tall), so the desk isn’t what moves, I am. It works great and costs less than half the price of a stand desk that moves, and you never have to worry about the desk’s mechanism sticking or breaking. When I stand, I oftentimes also stand on one of those inflatable, disc-shaped balance pads that are designed for core-strength exercises. It gives me fantastic core strength, balance, and ankle strength.