The answer is... it depends.
3 Townies
1 Scum
Pros:
Scum can't quickhammer and win the game as soon as one Townie votes for another Townie. Two Townies have to vote wrong (together) for Scum to quickhammer and win.
Cons:
Each Townie has three potential suspects, meaning a random vote has only a 33% chance of hitting scum.
If we No Lynch today and lynch tomorrow:
2 Townies
1 Scum
Pros:
Each Townie has only two potential suspects, meaning a random vote has a 50% chance of hitting scum.
Cons:
Scum can quickhammer and win as soon as just one Townie votes for another Townie.
In my opinion, we should mass claim today and then decide.
Why? Because the cons of lynching today only apply if we are voting "randomly." If the mass claim gives us enough information to lynch non-randomly, then we should lynch today, while we have more townies and it is harder for scum to steal the win.
If the mass claim doesn't reveal anything to us and our lynch still feels effectively random, then we should no lynch and put it off until tomorrow, when our odds for a random scum lynch are better.
I've already claimed, so I nominate my top scumread to claim next:
Battle Mage