<prompt> Human: It seems like the lone feature of a fund that sways PF readers one way or the other is the funds expense ratio...and that seems weird to me. I dont know much about investing, or all of the ins and outs, but I am a little thrown off to not see much more deep discussion past expense ratios. What else makes a fund worth keeping or dropping? Outside of expense ratios, where are the conversations regarding personal advisors? I guess I just feel like a large part of the picture is missing here, but I am not sure what.  <response>: The topic regarding personal advisors is a whole different discussion, but Ill address the ER question. You bring up a good point that is overlooked sometimes.Some people just have tunnel vision andor limited understanding of all components that drive one funds performance over another, and then tout lowest ER as why someone should pick fund XYZ over ABC.Some other things to consider and not a complete list between two similar funds, lets say a SP500 index fund since there are so many:- Fund structure: UIT or openclosed mutual fund?- Does it use a full index replication or sampling? Tracking error? - Securities lending revenue? kept by mgmt co or paid to shareholders? - Dividend income received by fund held in cash or re-invested? - Funds unrealized capital gains? Mainly for taxable account investors and most notable when comparing a long history older fund vs a new fund. - For exchange traded funds including closed-end mutual funds, premiumdiscount to NAV? 