the most versitile, easy to use , cost effective, economical developeri have ever used is sumatranol 130
ir is whole bean sumatra caffenol c with 15cc of stock ansco 130 / 1000cc caffenol
lasts 4-6 months, doesnt loose activity ( i processed 200 sheets of film( rolls and paper )
and it cost me about a penny a roll/ sheet ...
been using it since 2010 december and instant caffenol 130 since about 2006 may
i dont usually bother with anything else ...
oh .. it works in trays, stand develop, rotary processors too ...
good luck !
john