I used SmartGuard for a month. Their jar's code are so freaking old (aCis based package is 1 - 1,5 years old) causing 'hidden' issues you will find once you go live. Shitty Skype support - read none. A big no from my side.
Active Anti Cheat from another hand, their price is $300 and from second month, $35 monthly.
Strix and/or whatever. No idea.
For me conclusion is one, it's pointless to invest into it, waste of money.
Sure you may block most of the people botting (maybe), but nowadays there are various ways to bot and still people do it. Plus, player base drastically decreased.