The idea behind that was to give both race options purposes - normal Human Wyll having better preset stats for Dex melee Warlock, Variant Human Wyll being more fit for caster Warlock, normal Human Gale being more suited towards defensive / supportive schools specialization and Variant Human Gale being preset for offensive schools like Evoker. For such, I think 14 Dex could be preferable to 14 Wis, since Dex gives not only Armor, but also better Initiative. Though, if Wisdom is crucial, it could be something like 8 Str / 12 Dex / 14 Con / 16 Int / 14 Wis / 10 Charisma.
As for cantrip selection, I picked one that he cannot just learn from scrolls and with conditional advantages over his regular cantrips. Eldritch Blast has comparable damage to Fire Bolt, is rarely resisted and could be the cantrip tool to use against Fire resistant / immune enemies with lowered accuracy because of lower Charisma as a trade-off.
