PLO/8 $200 - flopped set OOP

[BlueBear]

Seat 1: MP+2 ($225.85 in chips)
Seat 2: LP ($80 in chips)
Seat 3: button ($159.60 in chips)
Seat 4: SB ($194 in chips)
Seat 5: Hero ($310.15 in chips)
Seat 6: UTG ($124.55 in chips)
Seat 7: UTG+1 ($303.30 in chips)
Seat 8: MP ($80 in chips)
Seat 9: MP+1 ($80 in chips)
SB: posts small blind $1
Hero: posts big blind $2
MP+1: posts big blind $2
LP: posts big blind $2
*** HOLE CARDS ***
Dealt to Hero [3h 5d Ad 5c]
3 fold, MP1 checks, MP2 calls, button raises to $10, SB fold, Heros calls, others fold

*** FLOP *** [Kc 3s 5h] (2 players)
Hero checks, button bets $20, hero ???

Should I check-raise/smooth-call or fold the flop? Would a flop pot in an attempt to take the pot down be safer? No reads other than the button is a competent aggressive player. Feedback and constructive criticism appreciated.