Hello , imho all sound the same . Ive own a macmini a macbookpro , an iMac a mac pro and a G5 , really all sounded the same . The really issue is to be clear of the use of the computer . This was my experience .
Mac mini , nice ,small but many times i wanted to use it for downloading music etc and of course you need the monitor etc for that .
Macbookpro . Was really fine because you can use it for many things , and you can use an external box to connect a pciE sound card . This is my choice by far .
IMac . Sound the same of all (optical) too big , i have it for work .
Macpro . Excellent machine , this is a nice choice if you do not care about expendin , you can use pciE directly and the noise of the fans is extremely low , in the case you use interface sound card use aes ebu as it cancell all noise .
G5 . Good but fans make sound soyou have to install it in another room and use a long cable , PCI ready , the problem is that veru
y new software like audirvana doesnt run in this .
Please decide upon versatility sound via optical is really the same in macs .