It's going to depend on the functionality you want. I started using Join Me since its release in 2010. It's from the same people that provide Log Me In and Go To Meeting. I evaluated which screenshare tools my mother could use, and if she can use it, clients should be able to use it. They've changed the pricing and plans a little and I am certain the covid work revolution and release of Zoom made them rethink everything.

Here is a pretty good review to start from:

https://www.crazyegg.com/blog/joinme-review/