New Customer - Wireless Vendor Choice

We may be working with a new customer that currently uses a mixture of wireless access point brands. I always prefer to use one brand to make management and monitoring easier. There may be 15 or more wireless access points required. There certainty will be the need for seamless roaming between access points. Also some of the access points will be in warehouse type locations facing more temperature and humidity changes than office installed devices. These could be managed via a FortiGate. Any feedback concerning Forti-AP's vs. other brands beyond the benefits of the fabric and the management via the FortiGate?