Personally when commuting, I'd go for kevlar every time.
I only had 3 or 4 punctures on my commute, prior to using tyres with kevlar inserts but that was enough (2 in 2 days). Within 1 week of fitting the Hurricanes they'd prevented that 1" nail from giving me a puncture and since then I've done about 2000miles trouble free.
(Hurricanes are semi-slicks so I wouldn't recommend them in this case)
I only had 3 or 4 punctures on my commute, prior to using tyres with kevlar inserts but that was enough (2 in 2 days). Within 1 week of fitting the Hurricanes they'd prevented that 1" nail from giving me a puncture and since then I've done about 2000miles trouble free.
(Hurricanes are semi-slicks so I wouldn't recommend them in this case)