Both seem to be a low pay rate for the hours worked, if you ask me. However, if you divide the time spent by the money you have at the end of each hour block, you're getting $3 an hour in the first case, $4 an hour for the second case. So, unless I'm missing something, I would go with the second deal being the better deal.
The second deal is better, but whoever is offering these 'deals' should be dealing with police right now... That's very low pay no matter which option one chooses.
second deal obviously :O for 3 hours more you get ~125% of your pay... yup yup :D