154CM has a little more carbon but that isn't the only issue here. It definitely has a better reputation than 9Cr18Mov but some of that has to do with the knives that have used these steels over the years. Essentially, 154CM with a decent heat treatment will hold a significantly better edge than 9Cr18Mov with an iffy heat treatment. In this case, we've got 9Cr18Mov with about the best heat treatment you'll find on it. So the question comes down to how well Kizer runs their 154CM.
While I've recently acquired a few Kizers in 154CM, I'm a relatively light user and they've been splashed into an already crowded EDC rotation. So I can't say how well they run it. I also haven't seen any testing on it. From anecdotal reports among the greater EDC community, people seem to like it on edge retention. On corrosion resistance, 154CM is stainless enough for most users but this category is a clear win for 9Cr18Mov.
This is a tough choice and honestly, I wouldn't make it based on steel. In other areas, I generally prefer the feel of Kizer's button locks but the Sencut costs a lot less. The overall quality of the Kizer might be
slightly better. (This Kizer is on par with the Civivi stuff whereas Sencut is more budget-focused. That's not bad but for instance, Sencut saves a bit by using free-spinning pivots. The fit and finish is still generally quite good, and materials like Micarta provide enough traction that I've had zero issues with mine.) At the end of the day, both of these should be decent EDC knives. So go with the more appealing design and give it a try.