wireless clients get a share of the uplink/downlink bandwidth to the AP. Having more available "free" time on the wifi side allows more clients to connect or some clients to have more time. The actual connection link rate is determined by the settings in the AP and physical RF environment, not the uplink/downlink share time. If an AP uplink/downlink is over wifi, then the two APs prioritize the AP to AP link time over that of the clients by several methods.
Whether or not you will see higher throughput for an individual client depends on the physical link rate and the available free time in the AP wifi connection and wired backhaul versus wifi backhaul. Wired backhaul is more reliable and usually higher throughput for the backhaul.
All 4 of my APs function over moca 2 bonded backhaul.
Realize that your local bandwidth may not affect how fast a web page loads, but it could affect how fast you can run a backup or large file transfer to a local NAS or server.