I have a 27 gallon (somewhat heavily) planted tank, and it's definitely
time to replace my fluorescent tubes. I am still using the generic tubes
that came with my Marineland Eclipse 3 hood.

I'm pretty much sold on the Hagen lights...mainly because they are readily
available where we live. I'm having a hard time understanding whether I
should go with 2 Power-Glo tubes, or with 1 Power-Glo and 1 Flora-Glo. One
of the local fish stores recommends the 2 PGs, while the other recommends
one of each. What should I do?

Or, alternatively, should I go with something completely different?

Thanks,
Jason