+1 for fibre, if you are moderately technically inclined the expense and complication is minimal.
I'd put a switch with SFP port in the outhouse as the cost difference is low and you'll always need more than one port. For the house end, if you don't have an SFP port available and need a media converter, consider the TP Link MC220L. I find them fine for domestic and light commercial use and they're often less than £20.
If you can, bury conduit in the garden so you can pull through whatever you want in the future. 40mm waste pipe is easier and cheaper to get hold of in small quantities than telecoms duct. My personal opinion is to not use watertight fittings so that any water that gets in has a chance to drain.
Live safe in the knowledge that fibre is intrinsically safe run externally.
If the cable (fibre or copper) has to run just above ground, consider steel armored types or other mechanical protection as I have seen rats, foxes and badgers all have a good chew or pull on cables.
Edited by ft247 (Mon 22-Mar-21 22:54:12)