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I think it depends on how you need to carry loads. If it's occasional big loads (supermarket/taking stuff to the tip/etc.), then a trailer is fine, but if you're going to daisy-chain various errands, then having a shopper/utility bike you can just sling stuff on is helpful. I think the appeal of the Omniums is that they feel nippy when unloaded or with moderate load? For me the max load on the minis would be an issue, plus they're a bit nice/pricey to leave locked up around town. Since I got rid of my bakfiets, I've been meaning to get an Elephant Bike (refurbed Pashley Pronto/PO bike), which should cover 95% of my shopping needs at a fraction of the cost of a posher cargo bike.
Thrustvector-
If you get an Elephant bike refurb (they are decent BTW, we got a basically new one that had been painted and new tyres/tubes/cables fitted for £325 delivered, insane value for money), plan on changing the gearing. Ours was ambitious, even for flat towns like Cambridge you'd never use 3rd gear. Changed the rear sprocket to the largest available for a Sturmey 22 or 24t from the fitted 18t, a new better chain (KMC B1 or Z1eHX), and fitted the metal Sturmey 3s thumb shifter instead of the plastic one.
Things a tank, does everything that average joe/juliet is going to need from it, goes to work (slowly), doesn't get stolen, lives outside all year round without issue, has huge F+R racks, comfy. Slow though, even unloaded, its a plodder.
BrickMan
I'm considering a touring bike + Bob Yak trailer combination for cargo/shopping duties which is rated to carry 32 kilos on the trailer plus what can go into panniers on the rear rack. This looks to be more luggage capacity than something like a smaller cargo bike like the Omnium Mini which is rated at 125kg including a rider. Not wishing to offend those who enjoy their cargo bikes (they look great), but what am I missing? Obviously, I'm not comparing with a heavy duty long-john type cargo bike.