A couple of thoughts:
1. OS X is smart enough to offload a lot of desktop rendering and such to the GPU, so a better GPU can help the overall responsiveness of the system. With that said, the Intel integrated graphics these days are no slouch
2. If you want more GPU power down the line, you do have the option with the Mini of using an external GPU(eGPU). It will cost you a few hundred(minimum) by the time you buy the enclosure and then a card to go in it, but it can also keep the computer current for a whole lot longer.
3. Don't hold me to this, but I'm pretty sure the iMac Fusion drive is SATA while the Mini drive is PCIe. That will make a BIG difference in speed.
4. Thunderbolt opens up a lot of options for external peripherals even in a small form factor box like the Mini. TB gives you direct access to the PCIe bus. Get the best processor you can now, but pretty much everything else can be done externally as needed/money allows(and at least on the better Minis you can add RAM).
1. OS X is smart enough to offload a lot of desktop rendering and such to the GPU, so a better GPU can help the overall responsiveness of the system. With that said, the Intel integrated graphics these days are no slouch
2. If you want more GPU power down the line, you do have the option with the Mini of using an external GPU(eGPU). It will cost you a few hundred(minimum) by the time you buy the enclosure and then a card to go in it, but it can also keep the computer current for a whole lot longer.
3. Don't hold me to this, but I'm pretty sure the iMac Fusion drive is SATA while the Mini drive is PCIe. That will make a BIG difference in speed.
4. Thunderbolt opens up a lot of options for external peripherals even in a small form factor box like the Mini. TB gives you direct access to the PCIe bus. Get the best processor you can now, but pretty much everything else can be done externally as needed/money allows(and at least on the better Minis you can add RAM).