Mcd1100 vs mct450 using ma7900

[Camsrep]

Hello. New to the site and in need of advice. I currently have. Mct450 connected to my ma7900 though coaxial cable. I have the opportunity to purchased a mint mcd1100. My question is if I use the 1100 through cd2 am I upgrading or just having a lateral move. Looking for best sound not the most flexibility. I only play RBCD’s. My 7900 is an older model without the din plugin on the 7900 so have to hookup via coaxial cable or rca or balanced connection. Other possibility is the mcd600 if that would be the best upgrade. Prefer to stay with Mac CD. Any advice is much appreciated
Speakers are Revel F228be wires transparent music link super audioquest coax. Thank you for your time. Regards.