Only as UK TV is 50Hz, US is 60Hz, so 50/60Hz is usually the same thing. Can you perceive this difference when not told which is which? It only has 2 physical ports, but remember each can be expanded into an array of other ports. If you had 2 multi-use docks for instance you could have as many as 20-30 ports on there. These things you cannot do with regular USB.
Either way the nTB model is the entry level, yes it has 'Pro' in the name of it, but it's status as a 'Pro' machine largely depends on what you do with it. If you type letters and watch Netflix for a living, it's probably great. If you're a software developer or designer, then no it's not that 'Pro'. Same goes the other end, an author might think a top spec 15" is overpriced. Really depends on your needs and perspective.
But yes, if you simply get these things when you want them you'll go round in circles trying to debate nuances of points on which is best, weighing up this or that, buying returning, endless. Then there will be a new computer in just a few months you should probably wait for, then it goes around again... Just get it when you need it, it's a simple decision then. "Do I need 15" with 1TB?", If answer 'Yes', go buy.