How to choose best custom research writing website online

I have been doing my final year PG Degree in one of the leading online university. After completing this PG degree, I have decided to do PhD research work and for that, I have decided to approach the http://www.bestresearchpaper.co.uk website to get my research paper work to be completed. Basically, I have chosen this website based on the advice gathered from my friends, relatives and neighbors. I need to know based on what factors the selection of online custom research writing website will be chosen.If you please list out those factors here means, then it will be more useful for all the people in the world.