EUB's while convenient, they are no substitute for the real deal! Cheap EUB's are just that... cheap. They will not get you the sound of a URB, even though they emulate, to some extent at least, the feel of an URB. To get a really good convincing URB tone from an EUB, you need to invest considerable amounts of money..... thinks 1000's of pounds! Quite often people buy cheaper model EUB's and end up spending vast amounts of money again getting them to play right, which defeats the object really.
Not all EUB's are bad though... it really depends on your expectations and ambitions. I've you're deadly serious about learning upright, then play the real thing... no ifs or buts! But, if you understand that a cheap EUB is a fancy fretless bass that 'sort of' emulates the URB, then something like the Palatino or Stagg are not bad starting points. But even these will need further investment to get them reasonably playable. Spend a bit more money and the NS WAV4 or Aria SWB are good choices, or even an imported Ergo would be excellent. If you have lot's of money then a Framus or high end NS is the way to go.
Good luck... it's a bloody minefield