Do I get my 2.4GHZ and 5GHz settings about right?

I attached my settings for 2.4GHz and 5GHz, under General and Professional.

I've 2 T-Mobile LG GPad X 8.0 (or GPad 8.0 III in Canada) and 2 LG G6, both have "n" and "ac", but somehow the GPad always prefers the 2.4GHz with link speed of only 72 Mbps and the G6 prefers the 5GHz with link speed of between 360 to 870 Mbps, the minimum link speed of the Lg G6 when connected to the 2.4Ghz is 144 Mbps.