How big is your room? Maybe 1hp enough?

1. I only have experience with Midea inverter from 2016, experience not great. Out of 3 units 1 died and since passed the compressor warranty I just gotten a Haier inverter to replace end of last year. Not long enough experience to say Haier inverter good or not.

2. I advocate cheapest non-inverter Haier & Hisense cause that’s what I have/own. Yes, Hisense most basic model outdoor compressor is noisier than Panasonic inverter.

3. Best you compare spec sheets to look at dB of the outdoor unit. Too many models to compare. 

4. My Mitsubishi Electric JR non inverter is also quite noisy in a back to back installation for my gym room. So being able to identify the installation spot also matters.

If it’s mission critical area e.g bedroom I advocate inverter for better temperature regulation and going with Acson if the price difference isn’t significantly more than Hisense/Haier/Midea. No point choosing the China mari if there’s no savings.
Very expensive. China 1.5HP inverters ~RM1.5k can find. I bought my Panasonic 2HP inverter CS-S18TKH for RM2580 in 2018. So 2500 for 1.5hp is quite expensive. I added the dongle for WiFi for RM199. If you’re willing to spend then sure.
Yes for inverter oversize is fine. Look at the btu output range. It can mimic a 1hp even tho it’s a 1.5hp. Just don’t oversize too far. If 1hp already too big for the room, 1.5hp inverter won’t help.