There's nothing wrong with having a new love. The heart wants what it wants.
I still love Malabrigo more. I got a hank of Misti Alpaca in that chunky size as a gift. It's so soft to touch by hand, softer than Malabrigo, but it definitely feels itchier on my neck than merino. I kept trying to make neck things from the Misti, the most recent being a neck warmer of my own design, but no matter how I do it, it seems I feel more prickly hairs scratching my neck than with merino. I'm just convinced that alpaca itches me more now, no matter how soft it feels on my hand.