Remember unlike the ATP written the FEW score sticks with you (unless you plan to get the cert which I can't think of a good reason to these days).
I recommend taking the ATP first and do good enough that you're not embarrassed or harassed on the ground eval by the DE because you passed by one point, then use the commonality between the two question banks to ace the FEW.
If you look at all the online applications once you have the cert they don't care about your score but if you only have the written, the score matters.
My bud let me borrow a Lone Eagle prep guide and it was top notch. I used it while prepping at All ATPs when a question came up. The 19 year old CFI certainly couldn't offer any insight.