Supplying electricity to a shed
Run individual THWN wires in a fat conduit, you'll thank yourself later
For your situation, I wouldn't even bother with a direct burial cable; instead, I would run a conduit (or two, even) from the house to the shed, and run 4 THHNs (14AWG is fine since you're limited to 15A circuits and a 15A two-pole breaker anyway by the 14AWG wiring inside the shed, unless you put a subpanel and ground rods in) in one conduit, leaving the other spare for communications cables.  If you want a precise size, I'd use 1&quot; for the power conduit and a 1.5&quot; for the spare; this lets you use a cheap non-fusible pullout disconnect on the outside of the shed as the shed's disconnecting means, and since you're powering this shed with a single multi-wire branch circuit, you don't need ground rods there.