Riftmaker vs bloodletters curse

I have had some trouble choosing between riftmaker and bloodletters curse as my second item. I know alot go rylai but I dislike the item unless I really need the slow. My item order is 90% of the time liandry->riftmaker->tank item (most of the time jaksho->tank if alot of dmg ap if normal-> ap item. I usually choose between swiftties, mercs and symbio (only mid lane) as the boot choice.

I may have my build totally wrong (example I don't like buying the new unending despair), what are you guys preferences between rift and bloodletters and items in general?