zAnti is crap unless you have the money to pay for credits, then it becomes an invaluable tool. dSlpoit on the other hand uses your device so of course its going to have more trouble than zAnti as it uses their servers (which is why you buy credits and can't just crack the app for unlimited credits, you would have to hack it server side.) To be fair I keep both zAnti and dSloit on my device but do use dSloit more, especially for MiTM attacks. I just love fucking with the Script Injection and password sniffing (as long as its not through https) gets the job done without using and zAnti credits
However zAnti is a powerful app and as said the reason being they do the more process intensive cracking server-side and not client-side. I just wish MiTM was free on zAnti, or make a zAnti thats client-side and then a premium that's server-side. I think it would be used a lot more!