Livechatinc is pretty good however since Tawk has a paid version without advertising it works pretty good also. Ideally I would prefer having a self hosted solution so that everything is on our own system.
I will vote for tawk.to
Tawk is free and has all the needed features. Once you have your business up, running and in affording position they you can go for other pay to use options.
Otherwise, just like us, you can continue to use it even when you people don't have any issues of budget.