things are a hit and miss...
i have a dawlance at my house. inverter. 7 years old, still working, never leaked, never dismantled. clean it myself without disconnecting any thing with pressure washer.
acson is abnormally high priced. i have several of them installed in porta cabins, and many have had their electronic control cards fail. new cards if available were 10k (non inverter last i checked)
i would say go with the brand that has spares readily available.
installation process is very important. i would suggest you do it yourself. not particularly difficult. but must have vacuum pump to suck out all the moisture laden air from the inside the piping to avoid corrosion related leakages.