The compressor units are and have always been disposable. But there is more to consider than the entry price. There is the parts and repair availability to consider. The operating costs matter too. A cheap unit is cheap to buy, but may or may not have good support and cost twice as much to run as that more expensive unit. And product support costs money. A lot of money to maintain. Top tier support can make up a a very large part of the cost of that new unit.

I have one daughter that works for a non-profit HVAC consortium designing and managing long term testing of HVAC systems across the US. And then writing research papers about it. She would tell you the Mitsubishi unit is the better and more cost effective unit over the long run. It will last longer, cause you less problems, and be cheaper to run over it's life time. (YMMV for any one random unit).

If you are simply looking for a quick and dirty fix because you are planning to move out in a year or two, then buy cheap and let someone else be on the hook for replacing it.