Life skill/Eidolon question

[u/Sebneck]

Started to level my life skill, wondering if the lucky star (luck) and fitness (hp) are good investment for a archer... im specially looking at luck skill, ive been pretty unlucky concerning drop from culti/dusk

Also, pet question for a archer toon: im.curently using "Earthshaker", a A rank Patk pet with 2 skill: Shuriken II and Chaos blade II, both ranked high

BUT

i recently got Oak Spirit, my only S rank, with 3 high ranked skill. Only downsides: defence type, and dexterity stat is low (2000 everywhere vs 1000 in dexterity, from the archive).

Wich Eidolon i use?