Not being a Cake user myself, I wasn’t aware they were working on a Breez SDK feature. Seth’s not as active on Nostr as the other place, but as the ops lead at Cake I imagine he’d have a lot of insights into this topic. I’ve seen him post some positive things about Spark, including in this article he published a few days ago.

Bitcoin Magazine

Spark And Ark: A Look At Our Newest Bitcoin Layer Twos

A comparison of the trust models and trade offs of Ark and Spark, the two newest entrants to Bitcoin's collection of Layer Two protocols.