MORE ATK! heh a 1 - 1 atk - hp ratio or a 9 - 10 serves me pretty well and it gives u that extra kick in swarmer fights and missions
think of it this way, commander bonuses included u have probly got bout 70% shields and even if ur enemy is using the ratios i just recommended to u, u will stay alive because his 53% from fleet experience and commander bonuses added up will probly give him something like 160 - 180% of ur hp but then ur shields kick in and suddenly that 180 has turned in to a 54. this works especially well if u can fill up all 10 fleet slots.
if any one notices something (besides grammer/spelling) horribly wrong with this logic plz lemme know cus it what i play by
*note*
the average commander wont use nearly that much atk and usually u'll only end up facing 100 - 120% ur hp in pre shield damages
also, these assumptions are for comparably priced ships (ur ship cost +/- 10-15%).
Actually you are right also.
If we want a really good ship we might say
Bang=A+H and have the constaint of E where A=effectiveAttack and H=EffectiveHp and Buck=ShipResourcesInTermsOfEnergy
Then we use Lagrange multipliers to optimize bang with respect to Buck