My story correlates very much so with the above, use the fixed not very often and the traveler hardly ever.
Consider what you might use it for would be my advice, are you going to be turning long thin stock quite a bit? Or you might have a very large piece of stock, say bigger than an inch dia. so it wont fit through the chuck but you don't want to use a shorter length and need a way to support it whilst turning, use a center of course, but how are you going to center it?
This is precisely the occasion it would be used for and many might not consider the fixed essential, but definitely important but the traveler could be considered for later.
Also, if you're going to use a different style tool post than the 4 way that comes with the clarke, your new toolpost may not correlate with the position that the traveler bolts to, so you'd need to do more moddery before that worked, but the fixed is pretty much timeless provided you dont change the bed!
Michael W