I'm trying to get a few opinions as I have had 1 electrician tell me i need a subpanel but his whole reason was so i could expand in the future and he didn't really listen to what I wanted. I have had another tell me no I can run a direct burial cable from my main breaker on a single 20 amp circuit to the livestock shed to power the light, 1 outlet for a water pump/heater and 1 outlet for a electric fence controller but I wouldn't be able to expand by much more. Given I only need these specific items, i'm looking at a total of 25 watt pump, 500 water heater, 1.6 joule output for electric fence, 60 watt lightbulb I believe I can do it all on a single 20 amp circuit as I'm sitting at less than 600 watts (assuming I converted the Joules correctly) which is nowhere close to 20 amps
90 feet is the distance from the current panel to the shed.