I know you said dwarves but as you are exploring other races mdps it seems. My vote goes to WL(White lion).
More durable and mobile(for catching & killing goblins) than the dwarven mdps/slayer thus more self-reliant.
At least 2 decent solo/small scale builds and a decent AoE build for cities/warbands/rvr. It's therefore the most versatile mdps order has to offer and will perform in all aspects of the game. Only downside is that the class is subject to a lot of changes, recently pounce was nerfed and it's quite weak now compared to previous version, also glaring pet issues.
As a slayer you're going to shine and be meta under organized conditions(guard/heal bots to unlock your true potential). WH you are not so desired in groups and will be forced adapt to a solo playstyle(Destro stealth class, WE is imho much deadlier than you, likewise Maruader is better than WL so general issue with the destro/order balance thus offtopic).
As a White lion you can enjoy all parts of the game with less friction than the other 2 imho.