Trying to make a choice

Ok those of you that have read my threads before realize I have QUESTIONS haha... Here is another one Flatbed v Box... I have an oppurtunity presenting its self to go to work for a flatbed company, small what I would call a Mom/Pop operation, that pays good. Willing to train. I will need to have my CDL first which unless I go to work for a large company that pays for it I'll have to foot the bill. OR I could go to work for a large company that trains you but have to stay there for a year before moving on...OK here is the question which pays more in the long run flatbed or box? would it be worth investing my own money or not... Thanks for any help