If you were only allowed to have one strain of brewing yeast [or other bug], which would it be and why.
34/70. Because it stores for long periods without degradation, is reliable, makes good beer, clears well, and can be used in a wide fermentation range.
WY1450…because it’s my favorite!
California Ale WLP001
Hornindal kveik, although I really enjoyed Omegas Tropical IPA and Bayern lager recently.