I've used the ones you have listed and I think I may have heard of the one you are considering - is it Rubrik?
I never used Rubrik and have heard good things. But when it comes to backups I personally wouldn't go with a start up. So many of them are written as being so wonderful and then they disappear. Or get bought and disappear.

On your list I would say RedGate SQL Backup was the most stable and easiest to use. And I don't work for them - I'd say they suck if that's what I thought.
Litespeed is better now but I had so many problems with the memory issues many years ago, I still have a bad taste for it.
The others were about the same but I also preferred not to use the agents and just have the software pickup the SQL Server backup files. That can impose some limitations on benefiting from some of the features of each one so that's something to investigate and discuss with whatever other IT groups are involved.
If you use the agents, they all don't support everything you can normally do with SQL Server backups and restores so make sure to check if it supports how you do backups now and how you may do them in the future, what impacts it could have on the restores, etc.

Sue