I'm in a bit of a dilema

I currently work for gloucester saab in sales, i used to be a valetor there but the offered me this job. I'm earning bout 14k a year but with no other benefits

well this is my dilema i love working here but i have been offered a job working for a valeting company earning 20k pa a company van and fone i've got to do do three cars a day then everyone after that is £15 a car

I dont know what to do!!

What do you guys think??