Morebeer definitely. However if you can wait, Spike Brewing is coming out with new ones:
http://spikebrewing.com/collections/fermenters
Let me clarify why. SS Brewtech makes a fine product for a really really good price. However, they utilize weldless fittings. Morebeer and Spike use all welded connections, and both utilize TC connections. Those are what the big boys use. You will be able to hook your Yeast Harvester right up to it. As for leg extensions I can't tell you that, however I know both companies sell them or in the case of Spike, can custom make yours if you need to.
Next move onto price and support: Morebeer is a great company and they do all their welding in house. Support is good, but not great. Its a huge company and lag time is going to be longer than some place like Spike. Not a negative for Morebeer. I've had several great experiences with them.
Spike is handsdown my favorite. I've only had one transaction with them, but they absolutely crushed what I was asking for and seriously continued to converse with me over and over for months before I pulled the trigger. The price was more than fair and the product is just amazing.
Price: Spike wins this contest. Morebeer is $699 for a 14G and Spike is $550 But they are not available till September.
Features: Spike has a sampling valve and 2 dump valves. one for yeast and the other for beer dump. Morebeer has 1 dump valve for yeast only and a sampling valve that doubles as a rotating racking arm. Both should be able to do pressurized transfers. Spikes other ones did, I don't see him not doing that again.
Personally, if you can wait get the Spike. If you can't you will be super happy with the morebeer conical. If you can reach out to Ben at Spike and see if he can confirm or deny any of the pre-production features for you and see if you can place an early-bird order.