Alsace 47°52'46"N 7°24'30"E | I would go with Ag Leader for exactly the reasons you stated: versatility and portability, all the more since you already have an EZ-Guide.
I think this stuff is too expensive to have a dedicated one on each machine / application. Furthermore, having a one vendor policy gives you the hope that all components will talk one to another and let you use one software to use the collected data.
Just my 2 cents
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