Fiber is great, but really overkill for anything other than Enterprise, not necessary for home use.
If you are burying a pipe then I suggest PVC. Use at a minimum 2" Schedule 40 PVC, & set it up with a pull line just in case you want to run additional cables in the future.
I would suggest, unless you are GREAT at terminating Ethernet Cable ends, that you purchase a premade Cat7 Shielded Ethernet cable for use in your PVC. You definitely want a good quality Shielded cable to eliminate any possibility of interference from any other lines that may get pulled in the future. I have used these Ethernet cables in the past and they work extremely well. https://www.amazon.com/Ethernet-Adoreen-Heavy-Duty-Shielded-Waterproof/dp/B09TP7YKST
How to run a "pull string in conduit"; https://www.youtube.com/watch?v=NOG-E8NQipY or https://www.youtube.com/watch?v=Frt0vJ4k15g
Poly Pull Line; https://www.amazon.com/ATERET-PL6500-Poly-Pull-Line/dp/B0B4F8FFT1