sit down and work out a plan, using timescales and budgets etc... and figure out
which service you think is best for YOUR site at any given point in time.
test, test and test again, then when you have a winner, simply scale that up by becoming
a repeat buyer of the service that you feel is right to increase your monetisation.
Keep in mind at all times that things chance in SEO land,
constantly in a state of flux, just be sure remain flexible enough to adapt accordingly.