What I like about Charla is a clean dashboard, and the ability to cherry-pick your customers wandering your website, sending them a message at the right moment. Ticketing system, mobile app, tons of features for the bot and unlimited messages. I might be not the most experienced user of such widgets, but I'm sure that's a great deal here!
Charla's team have just released a live AI translations, and even though I don't exactly need this feature, that sounds huge anyway.