Mr. Cool 24k mini split. Electrical install
Air conditioners don't quite follow the same rules as everything else out there

Due to the fact that hermetic air conditioning compressors invariably have overload protection built-in, the circuit breaker on an air conditioner circuit doesn't need to protect against a motor overload condition, just a short circuit.  Hence, the NEC lets you size wiring and protection for an air conditioner based on the Minimum Circuit Ampacity and Maximum Overcurrent Protection Device figures quoted by the manufacturer and listed on the nameplate, instead of using the general branch-circuit wire sizing rules.  (These figures obey rules found in NEC Article 440.)

In particular, according to the brochure's specifications for your unit, it has a Minimum Circuit Ampacity of 18A and a Maximum Overcurrent Protection Device of 30A.  So, you could run 10/2 or 12/2 NM to the disconnect, since the unit has no use for a neutral wire, then run a prefab 1/2" flex whip kit (1/2" LFNC with 3x 12AWG) from a non-fusible pullout disconnect down to the outdoor unit. (The signal cable on these units is an integral part of the lineset, so it is routed with that instead of traveling up the flex whip.)

If you need a service receptacle at the unit, 12/4, 12/2/2, or 10/4 NM can be used instead, with the black and white wires used for the service receptacle and the red and blue (or white/red taped black, red, or blue) wires used for the 240V circuit to the air conditioner.  In all of these cases, you'll be using a THQL2130 or THQP230 (30A, 2 pole) breaker for the air conditioner circuit; while one could use a 25A breaker instead, that may lead to difficulty down the road (namely, false trips due to a hard starting compressor).  The service receptacle circuit, if present, is then connected to a general lighting circuit in the panel using wirenuts and 12AWG THHN pigtails to avoid a double tap on the breaker, by the way.