Well, how a string or set of strings sounds "immediately" may not be much of an indicator of how they will actually sound after a few days or a week of getting played and "broken in".  You don't know what they sound or play like until you've given them a fair try, say at least a week?

I have heard people talk about some strings that take longer than a week to break in, but I'm kind of sceptical as to whether a string needing that long of a time to get to where it can deliver it's best sound is actually worth it.  But maybe to some folks it is, I don't know.

The problem with swapping strings out and back to compare is that every time you take a string off and then later put it on another violin or even the same violin, that is a form of wear/damage.  The very noticeable angle the string makes where it crosses the bridge may be in a slightly different place or the string may end up twisting a little bit, since you may not get it on the peg exactly the same.  That can damage the strings and shorten their lifespan, which is why I suggest you don't trust strings you've taken off a violin except maybe as emergency backups that you'll want to replace soon. 

So what I do is when I put on a set of strings, I play it until I judge it is at least beginning to be played out and are no longer good/reliable strings.  Then I know what that set sounds like, how long it took to break in, how long it lasts for me and had time to figure out how much pressure and etc it needs when playing to get all the different sounds it can give.

Then it can be time to try another set.

It is not impossible that after a few years, I might have tried enough different strings to see the possibility of a great set coming from customizing a set by mixing brands and gauges. But at only playing less than 2 yrs, I know I haven't heard enough yet to really know what I'm doing with that sort of thing.

An exception to that, though, could be the E string.  They always seem to get "tired out" before the rest of the set, so I'd think there is little harm in trying a different E string every month or 2, if you can manage it.  New single E strings are one of the least expensive, though, so that isn't a sort of experimenting that would be likely to get expensive as fast.

 BTW, just playing on the same set of strings until they eventually start to break and replacing them one at a time to keep going is probably the easiest way to get as bad a sound as you can from just your strings.  When they start to sound dull/icky or get slower to respond and seem to need more frequent tune-ups?  They're probably dying.  At that point you deserve a fresh set of strings, since you've played the set you have been using enough that you've gotten most of the best sounds they had out of them.  It can seem frugal/sensible to hold off on replacing strings "until absolutely necessary", but you can't really expect to sound your best if you are doing that.