Getting a Safariland 7378: does it make sense to get it sized for a Glock 17 to be able to use both 17/19 ?

I found an ok deal on a used G19 Safariland 7378 ($30). Looking into them, I think it would be convenient to get it for the G17 so that I may use it with both a 19 and 17.I'd be mostly using it with the 19, but I'm liking the thought of using it with both models, which is why I'm considering getting the larger Safariland 7378.Does this make sense, or will the extra bulkiness of it start to annoy me when using it mostly for the 19? via /r/CCW http://ift.tt/2rI6zhT