UTG makes no difference. Button has been quite tight over a small sample size. All in? Fold?

******* Hand 1 ********

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
UTG: $11.40
Hero: $120.55
CO: $21.75
Button: $118.95
SB: $131.25
BB: $113.40

Pre-flop: (6 players) Hero is UTG+1 with
UTG raises to $2, Hero raises to $6, CO folds, Button calls, 2 folds, UTG calls.

Flop: ($19.5, 3 players)
UTG checks, Hero bets $15, Button raises to $55, UTG calls all-in $5.4, Hero ????


Opp has been quite loose 48/15/2 over about 50 hands. I flopped the nuts and called the flop bet as I couldn't see him holding a set. Would you raise the river?

******* Hand 2 ********

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.50/$1
5 players
Converter

Stack sizes:
UTG: $27.30
CO: $97.35
Hero: $113.4
Button: $73.50
SB: $150.30
Hero: $113.80

Pre-flop: (5 players) Hero is BB with
UTG calls, 2 folds, SB raises to $2, Hero calls, UTG calls.

Flop: ($6, 3 players)
SB bets $6, Hero calls, UTG folds.

Turn: ($18, 2 players)
SB checks, Hero bets $13, SB calls.

River: ($44, 2 players)
SB bets $20, Hero ??