I think you will be disappointed by the storage space in the 128 GB model. It is very slim and you will fill it up fast. Apps for OS X are much larger than apps for iOS. If you're interested in storing media locally, HD video and audio take up a ton of space as well.
Depending on what you do with your computer, a new Pro will probably seem faster than an older iMac thanks to the flash memory used in the MacBooks. Storage space is a lot smaller but load times are very quick. It's unlikely you'll miss the extra 4 GB of RAM but if you frequently multi-task or use memory intense apps (Logic Pro with lots of plugins, virtual machines, etc.) you may notice the MacBook not keeping up the way the iMac can under heavy load.
If your iMac is a quad-core CPU, you are potentially giving up significant CPU performance (Quad-Core Sandy Bridge still compares favorably to dual-core Broadwell). Again though, it depends on what you are doing. Basic tasks (office work, web browsing, media) require so little CPU power that a dual-core is just as useful as a quad-core CPU.
12-25-2015 02:04 PM