Low pair or 4 to a flush — which do you keep?
Keep the four to a flush. Exact EVs on 9/6 Jacks or Better: the flush draw is worth 1.2128 per coin vs 0.8237 for the low pair — a 0.389 difference, one of the largest everyday mistakes in video poker.
The exact numbers — 3♣ 3♦ 7♦ 9♦ K♦
EVs are exact — every possible draw enumerated, not simulated — at max bet on 9/6 Jacks or Better. Check it yourself: the analyzer runs the same solver in your browser.
See all 32 holds of this hand ranked →Why
Nine cards complete the flush (paying 6), and the draw keeps live straight and high-card chances. The low pair's value is mostly two-pair and trips — real, but worth much less than a 19% shot at a 6-coin payout. Note the reversal below: against a STRAIGHT draw, the same pair wins.
Chart line #8 of 18 (4 to a flush) sits above line #9 (low pair) on the Simple+ chart. See the full solver-optimized strategy chart, or drill hands with exact-EV feedback until plays like this are automatic.