nothing wrong with Blesta. i have been using it since I restarted my hosting business and have had no issuesHave some stats?
There is nothing particularly special about WHMCS.
Most of big businesses in this industry use their own billing software. I don't think any of the providers I buy from use WHMCS. When I see it anywhere (I know it's highly subjective) that resource loses credibility for me. Because: it can be run by newbie or if they are rather known businesses, they usually don't bother customizing WHMCS to fit their main website design perfectly, which should be done in such case.