I don’t think we have too many dobro players here, welder, and my knowledge is so limited it’s probably not worth a lot.
In general, if you’re looking for a bluegrass dobro you probably want one with a spider cone. If blues is your thing you’d probably want a biscuit cone.
When it comes to manufacturers, things get really confusing because builders have merged and divided their companies so many times over the years. Epiphone (Gibson) has the rights to the “Dobro” name currently. They market the entry level “Hound Dog Dobro”. A step up would be something like Paul Beard’s Goldtone series. Seems a lot of pros like Scheerhorns, but they’re pretty pricey.