Is there any difference between Dude for 7.6 and Dude for 6.48.6?
There are no differences I've seen between V6 and V7. In fact nothing has changed in years in the dude.
The main benefit of the dude is:
- runs on the router itself, so no extra hardware
- no agent required on other Mikrotik routers to full monitoring (e.g. you just need username/password, but no setup on monitored devices for dude to monitor)
All the UI and notification methods are extreme dated and clearly Mikrotik doesn't update it, so that the big downside. Certainly no web GUI either. And other limitations. But it does work well to monitor/record data from other Mikrotik devices well enough with no extra hardware/software (beyond install the dude package on one router).
But for "multi vendor devices", most NMS help you setup the right monitoring for the device. And well have docs to help. While Dude help with monitoring link speed on another vendor (e.g. via standard ethernet/etc MIBs) beyond that you're own your own to pick things to monitor using "custom probes".