Search function and basic guides would have helped (on this site: "game info" -> "sailor tree" or www.nf-guides.com or http://trainworld.us/NF2/English/sailor.html).

To make it short: potential is the main stat for both, and nice repair/restore (base 10) would be a good secondary stat.

Let me also add something very general (again).  Engine stat only applies to engineers.  It doesn't help on repairers, restorers, BOs, planeman etc etc.

It's amazing how stubborn some people are about this even with OH time etc now visible directly in their harbor

OK, that makes sense.  I did try to look it up on this site but just could not find the info,  I must have missed it.

THANK YOU!!!

Class your planes man on time with highest pot possible.

Sonar man can delay classed to gain more SD as it is pretty easy to cap out sonar range.

Repair is worthless on a submarine as it does get a 70% penalty.

And as said before, engy stat ONLY matter on a Engy Sailor.

Your best bet is to buy 3-4 hero sailors with +14 stats across the board for your SS. This will give you the best possible stats for your crew. A minimum of 2 hero sailors for 1 planesman and 1 sonar and a bonus 2 hero sailors if you want to use those for torps. Obviously Boost vet and expert your crew as you see fit but i have heard this is a the best way to go for SS. Granted Elite potential does give you a +15 your other stats dont come anywhere as close as a hero sailor will.