I fear there isn't a single valid answer (nor I found an official Best Practice HPE Guide/KB Article about it despite the argument of broadcast/unicast/multicast storm suppression - plus other similar features regarding ARP flooding - is discussed on official HPE switch series documentation): it depends on the type of storm you need to fight against and your network characteristics (knowing nothing about how many pps or kbps the storm can generate and the type of traffic the storm will be formed of...the only reasonable thing to do is starting with restrictive suppression values and fine tune them along the way...say starting with - as example - 128 or 256 pps - restrictive - up to 1024 or 2048 pps - less restrictive - threshold values).
Possible useful threads: here, here and here