I have a 18K btu Senville Aura half installed in my kitchen. Waiting for weather to finally become nice to run lines outside and pour a cement pad for the base. This was a nice unit, it is quite large compared to the Senville Leto 9K btu I just finally finished running the lines on my truck camper. It had a nice template you can hang on the wall so you can move things around to line up with studs. Pioneer did not come with a template.
The Senville Aura 18K btu was purchased direct from Senville, it arrived in about 2 to 3 days.
I purchased a 12K btu Pioneer floor mount direct from Pioneer last year. It has been a pretty good unit but if outside temps are between 20°F and 30°F, it likes to defrost often. I contacted support, they gave me the link for the service manual and it is possible I have a temp sensor that is defective. I'll need to use a graphing ohmmeter this summer and check the sensors thru the entire temp range. Unit works fine below and above those temps. It is not an arctic pump model but I've ran it at 4°F and it worked fine.
Defrost on the Pioneer is not really timed. It will defrost after 2 hours of run time if the outside unit core temp is below 5°F if I recall correctly. There are 2 other scenarios for defrost, I'd have to look at the service manual again. Some of the cheaper units will defrost after a set time has elapsed whether defrost is needed or not. I don't recommend one of those units. If you can source a service manual before purchase and determine how/when the unit defrosts might make a difference on how satisfied you are with the unit come winter. The preferred defrost is based on a temp sensor and defrost only occurs when needed.
I'm impressed with the Senville Aura 18K btu. It came with Wi Fi built in (USB). The Pioneer I bought a universal Wi Fi module and control the unit mainly using the app on my phone. I can check ambient temp outside and inside the house on the app plus turn the mini split on/off from anywhere with cell phone data access.
At this point even though I have not finished the kitchen install, I'd recommend the Senville Aura over the Pioneer. The Pioneer wasn't the higher end model. My camper Senville is just a Leto and it will be used mainly for air conditioning. If you plan on using a mini split for heat, go to the higher end models.