solo or group?
sc or hc?
melee or caster?
daggers or swords?
heals available?
we'll need some more info.

Swords get most their damage from strength. ninjas feel quite hampered when using swords because you cant make much use of that high basedex. (source: switching from swords to similar ee daggers increased my damage across a full climb by around 20%)
solo i wouldnt do with less than 80 vita.
jumpattack is pretty strong but it can feel like a lot of wasted potential on solo because you'll rarely even hit 2 monsters in 1 column. i much prefere twohitback and powerstrike.
if you have decent heal charms available you may want to spec into retribution to cut down on regen times a little, but its only worth it if you have some real healingpower. some would argue you even need some int with it.

In general: you wont like the last few levels. doesnt matter if you use stat or ee robes. 73+ is quite annoying to solo on robe melee's unless you have REAL BOSS gear.
GL

Depends on what you’re using, sword’s would of be strength daggers would be dex

that's not based on the class but on the weapontype youre using.
https://ladderslasher.d2jsp.org/index.php?g=3 the str/dex ratio on every wpn type there shows you which stat to prefere (note: axes dont care)

Ninja = Robed character = taking shitloads of damage; thus to counter this you would need to increase either the EE on armor (which is actually pointless) or your damage (using the basic crap of stat placement to Damage vs Hit points [phys defense]).

You choose, you have to kill off hard phys dmg monsters while trying to get to level 79... now you if you are melee, you have EE weapon, if you are defensive you use EE Robes (sucks to be you), now you need to survive, so maybe EE heal charm (right, you need Int base to get mana pool up and aid in healing) ... yup, conundrum.

Basically... test it out for yourself;

#1 What abilities you will use... for example, you may go 50 base int and use a 1xx% ee level 55 charm while using the ability Salvation while solo'ing?
#2 Use Life regen gear while having a base of 100 vita so you can carry on faster etc (well, depends on the EE weapon and other items you use right?)

#3+ Use a modicum of your own intellect and play-style to get the answers while testing them out.