i usually pick the one that is the size i want and one that installs closely to the original drain hole. other than that im not sure of differences or features between makes and models ... if its cheapy looking i pass on it. but i think its the way to go for a diyer no mud bed to deal with less tiles .. bathrooms are fun to do cause theyre small and dont take forever like my hallway thats going on 6 months since i started and i dont think im ever going to finish it. hahahaha. but i am doing some detail work so its takin some time .... im sure some of the plumbing experts here can point out some better recomends on that base.