PokerStars No-Limit Hold'em, $0.50 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($14.15)
Button ($33.60)
SB ($50.20)
Hero ($52.25)

Preflop: Hero is BB with A, 9.
1 fold, Button calls $0.50, SB completes, Hero checks.

Flop: ($1.50) 9, 4, 4 (3 players)
SB bets $1.5, Hero ???

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Villian and I have played a lot together, he seems to be a straightforward TAG at 17/9.5/1.71 over 400 hands.

What's your play here?