Re: ~! Sometimes u feel so luckyy!
You are correct not to generalize it… I will give you my point of view anyway..
Anyone who comes in Islam after realizing that it is Truth does not go back. That is what I have seen so far. We even do not realize what we have as a Muslim but those who realize without being muslims do not go away.. trust me… Whereas, those who come to Islam and then convert back are the one who reverted without the realization but of other factors… I have seen many people who bacame muslim to marry a muslim and then reverted after the divorce 
Second Point, them being a little better than us in Taqwah is what Prophet:saw: tells us that one who comes in the fold of Islam is as if he/hse is a new born - no burden of sin at the back. Ofcourse, there are good pious people out there who are born muslim… but a revert has no sins to begin with.
MHO…