I'd backtrack, as I've just checked and without the "tele-" prefix, the Xenars aren't telephoto. It's going to come down to personal preference for the focal length. Many years ago, it used to be advised that you should double/halve focal lengths when building up a set. A "rule" more observed in the breach, as people had the trinity of 35mm/50mm/135mm - these were 35mm days!
I generally prefer longer rather than shorter lenses, and if I had the 90mm covered, I'd double it and go for 180mm. My favorite focal length on 5x4 is 210mm, and to be honest if the Symmar had been convertible the extra length would have swung it. My choice of lenses for 5x4 differs considerably from 35mm, where my two lens outfit for light weight was 21mm and 90mm. With 5x4, I seem to stick with a normal for the format lens most of the time. That's how I "see" things - rather stuck in the past, as in my young days (or even earlier) long focal lengths were recommended for landscapes rather than the ubiquitous recommendation of extreme wide angles today.
The later Symmars are "better" than than the older ones, in that the multicoating does reduce flare and increases the contrast - although extra development could compensate for that.