I have an iPhone XS Max and a Ruckus R730 access point with 200Mbps internet connectivity. I just speed-tested my iPhone and got 200Mbps download speed. So this phone is certainly capable of higher througput.
However as mentioned by Sandeep and Abi there are MANY
variables at play in a Wi-Fi network that can degrade performance and clients can be impacted very differently. For example; a laptop will (generally speaking) have a higher perormance
NIC (Network Interface Card) and a more powerful transmitter and a
higher-gain antenna - all afforded by it's greater size.
You need to ensure the wireless network is configured correctly for the environment and the desired performance. Also remember the 2.4GHz and 5GHz frequencies (usually) provide very different levels of performance and depending on the environment, the iPhone may prefer the 2.4GHz network, which will (usually) give lower performance than 5GHz.
You can use the Ruckus Speedflex App on iOS devices to test throughput between the device and the wireless network - simply specify the Ruckus AP as the 'Destination Address' in the app. I just tested my iPhone XS Max and got a througput of 398Mbps download and 241Mbps upload. But bear in mind the R730 AP is an extraordinarily high performance AP. https://itunes.apple.com/gb/app/ruckus-speedflex/id556602787?mt=8
My recommendation would be to seek the advice of a Ruckus specialist wireless expert.