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@miro_o
fix/fix is the most versatile. You can still put a freewheel on the cog threads.
I've had a 16 and 18t cog on my back wheel this summer. So 48x18 for most stuff and 48x16 for flatter group rides, or a short blast on my own. I'll go to 17 and 19t again in a couple of months for long spinny winter riding. That felt about right last winter.
If your dropouts are long enough you can get a 2 tooth difference working, but you might need to adjust rear brake pads (if you've got any).