Hamilton added also that super soft will long-lasting but that it did not give the one-lap advantage that has been make out for most of 2012 season.
"Tyre degradation could be an issue, and it will be very close, Ferrari seem to have to have good tyre degradation at the back end of their car, at least in the last race, so it looks like it could be another one-stop race, with the tyres doing well over 30 laps," Hamilton said.
"I preferred the prime to be honest even though the soft did go a bit quicker. It wasn't as big as it normally is, it is normally quite a big gap but I think it is only three or four tenths difference," he said.
Ferrari team manager Massimo Rivola quoted the same things with Hamilton's estimation.
"I think it will be one of the key points of the race," he said. "I don't know how many of us were convinced Monaco would be a one-stopper. Today we've seen very long runs from whoever has used the super softs more than us.
"We've seen [Sebastian] Vettel doing 19 laps on super softs while remaining very consistent. We've seen both Lotuses in FP1 doing 21 very consistent laps.
"On paper it's true it may seem like a one-stop race, but Sunday's temperatures will be very different from today's. With probably 15 degrees more in asphalt temperatures it might be a completely different scenario, so we'll need to be ready to react depending how it presents itself."
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