Hi there !
There isn’t a kind of printer that would deserve the title “best on the web” all printers have pro’s and con’s you jut have to evaluate how much you are willing to pay and what features are necessary for you.
Open source is allways nice, especially when you can improove on the printer, also open source printers usually have a large community with many printable improovements.
Regarding the dual extruder you should definitely look into this. There are many occasions when you need to print in two colors / two materials / support material. Also this would enable printing flexible and rigit materials within one model.
Since you haven’t had any 3d printer before you shouldn’t go into overdrive and purchase the biggest, most expensive printer that has tons of features that you might never use.
Even though you’d use the printer for a buisness you should look into printers in a price range of 1500-2500€. My first recommendations would be the Creatr HS (which I have), for more buildvolume the Lulzbot TAZ 5 would be better. Also the lulzbot printers have upgreadable extruders and are open source.
A very reliable printer and popular printer is the Ultimaker 2, it’s available in three sizes, the medium or large would be good for a buisness.
If you don’t want to invest as much you could also get the small Ultimaker 2 or the Lulzbot Mini. If you are interested in printing in many materials you should get printers with either upgreadable hotends / open source printers (where you can change the hotend yourself) or printers that can print over 250°C hot.
You will also most likely have heard about the Makerbot printers, I wouldn’t recommend those. These are “very closed source” meaning you can barely do modifications and the Makerbot printers are very overpriced for the provided buildvolume, printspeed, materialvariety and quality.
If you want a cheaper printer to get into 3d printing the Prusa i3 (colorfabb.com offers a decent one for 500€) or the Printrbot simple metal are worth a concideration.
No matter which printer you’d choose, try to find a local hub, that owns this printer and ask them, if you can take a look at the printer and if they could share their experience.
Cheers,
Marius