As u already
know there are different types of implants available in the market.
The most important aspects in an implant are the grade of Titanium ( grade 3& 4 are common), type of surface treatments to initiate its integration with bone ,etc. there are various factors which have to be assessed clinically and on radiographs too. You should ask your doctor about all these things before opting for any implant. Most of the implants available offer surface treatments and platform switching concepts which is something very technical for you to understand.