X-wing is more deadly. But that can be worked around.
If you look at 'campaign' systems for wargames intended to link a series of battles together in to some kind of meta narrative, they will usually assume that being defeated on the tabletop doesn't mean the death of the character.
For instance, in the Strange Aeons cthulhu mythos skirmish game, if a model is taken out, after the game you roll a D66 on this table, subtracting 1 from the first dice if the model isn't a hero/pc/named character.
11-15 Dead (remove from sheet and re-equip if needed)
16-21 Multiple Injuries (roll D3 times on this table, rerolling any further Multiple Injuries
22 Leg Wound (-1 Movement)
23 Arm Wound (+1 Dexterity)
24 Agoraphobia (Fear of open spaces. If not within 1” of a terrain feature upon Nomination,
the model may only Move)
25 Crippled (only 1 Action per turn)
26 Chest Wound (-1 Constitution)
31 Teratophobia (Fear of monsters. All enemy models are Hideous and cause Fear)
32 Poor Health (Before first turn roll D6. On a 1 model unable to take part in this game)
33 Ballistophobia (Fear of bullets. Model must pass a Resolve test to use Ranged weapons)
34 Head Trauma (+1 Resolve)
35 Claustrophobia (Model must pass a Resolve test to enter scenery. If failed roll -2 on
the Insanity Table)
36 Amnesia (lose 1 Skill)
41 Acrophobia (Fear of heights. Model must pass a Resolve test to climb any scenery over
2” above the tabletop. If failed roll –2 on the Insanity Table)
42 Weakened (-1 Attacks)
43 Haphephobia (Fear of being touched. Must make a Resolve test in base-to-base)
44-54 Full Recovery (No permanent effects today…lucky!)
55 Hemaphobia (Fear of Blood. Make a Resolve test if ANY model is removed from the
table due to injury within 5” and line of sight)
56-61 Hate (Model Hates the enemy model responsible for the Major Injury)
62 Hardened (The model no longer suffers the effects of Fear)
63 Horribly Disfigured (The model is now Hideous)
64-65 Basket Case (The model is immune to Psychology. No Resolve tests need be taken.
Spells may not be cast by this model)
66 Nemesis! (the model Hates the entire cult responsible for the Major Injury)
which means a major character is only permanently dead about 13% of the time, and an extra about 30% of the time. And that is probably pretty harsh as such things go.
So, you can probably assume that when a model is taken out of the game in X-Wing, it doesn't mean the pilot is killed, but rather that they ejected or launched an escape pod.
Or even, if you can sell it to the players, who tend to hate this sort of thing, that the defeated fighter has disengaged and bugged out or spun off in to space like Darth Vader at the end of Star Wars. For instance, I am playing a space combat game called Project Sylpheed at the moment, and when you do enough damage to an enemy ace, rather than them dying in the fireball it triggers a cutscene in which they make their escape. But players hate that, so ejecting might be easier, so long as you can convince them not to start trying to machine gun pilots as they descend to earth on a parachute.