As II said earlier, the 3 inch mark is great for me. As for balance, I like it to pretty much even out down the line. Not too keen on one end heavier than the other. Merkur head on an MR1 handle is working out just about perfect.
My order of preference in descending order is: intermediate handle, short handle, long handle
But the preferences are slight.
Yep, that's my take on this above, early into my new having hobby here.This ^^^.
I prefer a long heavy handle. Around 4 inches. About 100 grams total razor weight is where I am comfy too. But I also enjoy a shorter and lighter handle from time to time. Like a fat Tech handle, or common bar NEW. I can shave effectively with any handle.