The real answer is that there is *no* best bass. You select a bass just like you pick any other tool - what works best for the job you have planned for it at the budget you have to spend.
And no, that's NOT, a smart ass answer. If you think it is, please take a step back and try answering this question for me. I won't give you any information about why I need this tool but I want you to tell me which is the better tool - a #2 slotted screwdriver or an offset screwdriver?
Simply put, your friend needs to try a lot of basses, see how they sound, see how they feel, see how much they cost in order to see what will work best for him for the amount of money he has to spend. That won't be easy to do, but he'll learn a lot in the process and will ultimately make a better decision FOR HIM. I know you're trying to do him a favor, but telling him what to buy really isn't helping him.