"Main gaining" is doing the rounds at the moment, as it ultimately gets almost the same muscle gains as the traditional bulk, cut without the swings in body fat, back and forth. This assumes you are not trying to be a mass monster, and not doing PEDs.
You possibly get better body composition on a cut, due to being in a deficit, which may make your keytone levels and higher (nowhere near dangerous levels), ketones are muscle sparing.
My bias is ketogenic building as the results are "real". By real I mean you are not pumped up. I have noticed that many of the old time body builders ultimately lose the inflated mass. I think it is healthier to build to a natural genetic limit. Keto Savage is a great exponent of the art of natural ketogenic body building.