I rate AGM batteries as the loss of charge is much slower iirc they were developed via Leisure Batteries.
On older cars you can switch battery type, Ah & CCA with impunity on more modern cars you have to update the ECU system for the charging rate to accommodate them. Might be the case with modern bikes as well.
On Wendy's Freelander 2.2 TD4 GS 13 plate I fitted an AGM battery 80 Ah 800 cca for £137 from Tanya Batteries no software update was needed. No stop start though.
That said if a vehicle is used pretty much daily the cost difference imho can't be justified just stick with standard or Gel. Over the last 10 years the cost difference has narrowed.
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