I think you do the research on this forum, gain knowledge and then make your decision based on your feelings. Some people always want to buy the best product available and there is a lot to be said about that. Others want to buy the cheapest product and that isn't always the best solution. Somewhere there exists a compromise. Also, you might buy the "best" today and then a better product comes along, so then do you replace your stuff.
I have a go-power 30amp controller, it doesn't have blue tooth but the new ones do,($124) so I have to visually check it. I have 2 Renogy 100 watt panels ($115 ea on sale) and 2 Renogy 260 ampHr 6 volt batteries. My system works for me running 2 Cpap machines, a National Luna refrigerator / freezer and the FWC OEM furnace.
Yes, I would have better knowledge it I had a battery monitor, but at the end of the day I am very comfortable just using the built in meter in the solar controller, which displays, amps from the panels, voltage on the batteries and percent charge. I also have the OEM Blue sea ACR which charges the house batteries with the alternator. Again, reading everything here about size of wire and the Blue sea ACR, it isn't the best setup for charging from the alternator, but again, it works for me.
I am sure there are many others out in the field with various less than optimal systems doing just fine.
Everything is a compromise, pick yours. Good Luck