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Clustering still doesn't have complete feature parity with traditional HA, so make sure you check out the docs for the version you're on to find out what to expect. https://docs.citrix.com/en-us/citrix-adc/13/clustering/cluster-features-supported.html

Most of the time HA is the right choice in my opinion, as always it’s based on your requirements, most people think they want active/active for everything but it really may not provide any value depending on your requirements. It adds complexity, reduces features supported. The main reason I look at clustering is to scale past the bandwidth capabilities of a single NS which many customers do not do, I have only seen it add value a handful of times. Fan of pooled licensing options though.