For those that have both a ZRock and 25th anniversary mods on your amp, which made the bigger improvement?

On a budget and trying to determine whether I would benefit more from getting 25th anniversary mods on one/ all current Decware, or getting a ZRock2 (with or without mods) I currently have a CSP2+, SE84C+, and Mini Torii. I don't currently use them all together, but in separate systems.

I am on the waitlist for a n SE84UFO with 25th anniversary mods with original thought of hearing difference in UFO and mods compared to current gear, but I am now wondering if the ZRock will give me more improvement.

Thanks for your thoughts and experience, Jon.