This probably isnt a tough one to answer.

Opp is about 35/24 over a fair amount of hands. his AF is about 40% but no alarming aggression on any particular street. Opp isnt a good player.

In hindsight im thinking that simply leading river is way better than c/r'ing but Id like to hear opinions. My c/r size is also too big but i added on some $ since i figure he is a bit of a stationy bad player.

On river is this an easy fold or call?

$0.5/$1 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG elkam ($123.60)
UTG+1 BaxterRS ($165.70)
CO Barney_Gamble5 ($100.00)
BTN polarni ($100.00)
SB Hero ($104.40)
BB Gsus4 ($125.05)

Pre-flop: ($1.50, 6 players) Hero is SB
elkam calls $1, 3 folds, Hero raises to $4, 1 fold, elkam calls $3

Flop: ($9, 2 players)
Hero bets $6, elkam calls $6

Turn: ($21, 2 players)
Hero checks, elkam checks

River: ($21, 2 players)
Hero checks, elkam bets $12, Hero raises to $42, elkam raises to $72, $30 to Hero ($52.40)?