Luck has 2 stats amp with Thunder God's Armor: the first armor significantly increase his speed while the second allows him to blitz people who could keep up with him when he was using the first Armor.
Luck also has Rage Power and RPL if that's not enough
Speed Booster and Pre-Cog helps deal with the Speed Amps.
Ice Beam, Wave Beam, and its dura-negging properties means both can one shot.
Her AoE counters Danmaku.
Samus however has experience with faster and stronger enemies (Ruins Test) with danmaku too (King Worm) which occurred without any of these abilities. Gonna give it to Samus 5.5 / 10 of the times due to that.