Assuming you don't run over pot holes, curbs and stumps for the fun of it daily, then I'd go for the lighter rim. And unless loaded weight is near max, then I'd probably opt for the 36 spoke version on the back and 32 on the front instead of the 40. Wheels of equal weight and same tires that have lighter rims should require less wattage. Though probably a minuscule amount.

But I'm certainly no expert at wheels in general.