Best is relative! For me, multiple daily shots at double digit bones (even if that means two) and 25-50# tarpon (hook a couple a day and see more) is all I need to get me smiling at the cabana for the after-dinner rum drink and cigar. I also value the quality of scenery, the freedom to explore adventurously and find things that are off the beaten path; meeting interesting indigenous people and other adventurous travelers in a tropical setting away from a northeastern US winter.
My experience has been that DIY gets better the more times you go to a particular area, as the knowledge you pay for in a guide takes some time to acquire on your own.
Cost = flight + jeep rental + food + lodging; the rest is up to you...
I'm still exploring but tarpon DIY is going to be best during the pilchard migration in the Virgin Isles, Carribean - and bones are going to be best in the Bahamian out islands where there is no private enterprise activity to contend with not only in terms of competition, educated fish but harassment from guide businesses (e.g. Exuma).
However we'll keep searching won't we