Being the Bass Head I am & given the your choices Id say go with the Fosgate Sub by far. Nothin against Pioneer....but its like comparing an el camino and a Hummer ( a 300w RMS Hummer).

That amp will put out maybe 250-275 RMS at all times if everything installed professionally. which is enough for the RF sub. its a good match really.

Plus it will hit the lows tight and still get loud. I really recommend a vented / slot ported enclosure definitley.