MicroATX has almost certainly always been more popular than MiniITX.
MicroATX motherboards are usually cheaper than ATX or MiniITX and you can typically use normal PSUs and optical drives instead small ones that are more expensive and have fewer options.
You can always put a mini ITX board in a full size ATX case if you want though...
[delayed]
I used to love the mini-itx form factor. For the time, lots of features in a compact space. I think micro atx might be a more popular form factor now?
MicroATX has almost certainly always been more popular than MiniITX.
MicroATX motherboards are usually cheaper than ATX or MiniITX and you can typically use normal PSUs and optical drives instead small ones that are more expensive and have fewer options.
You can always put a mini ITX board in a full size ATX case if you want though...
Reminds me of running good old TinyXP.