For some good photos please consult Steve Hughes' book Custom Rifles in Black and White. Please note the non-original levers on these rifles.
IMO the Dakota is somewhat ugly unless the lever is changed, please see Steve's more-solid-appearing example in his book. OTOH one of the Hagn original-design levers IMO is ugly while the other IMO is just about perfect. Ed Webber's Hagn lever alteration shown in Steve's book is also IMO very elegantly beautiful.
Both actions are plenty strong and safe but I much prefer the Hagn, AAMOF I'd rather have a Ruger than an unmodified Dakota. JMO.
Regards, Joe