I tend to favor the stall when doing a sit down mode, since the usual Urinals are not very comfortasble or dignified, and or other people appear confused or upset or stare too much.
Whizz-wise, all depends on the setting and context.
If anything feels iffy or a bad setting, or loitering sketchy people, no people and late hour, or any reason to me for caution, I just wait, or go water a Shrub or a Tree outside somewhere.
'Situational Awreness' is one's constant 'Radar' and friend...even if erring on the side of prudence...or especially erring on the side of prudence.