Probably about the biggest advantage of the bolt action varmint rifle, for most shooters, is that it's relatively easy to find an inexpensive bolt action that will shoot accurately ..... perhaps with a minimum of work ......... usually trigger and/or bedding.
That's not true with the single shot rifles. Except for the NEF, which is inexpensive and has it's own unique quirks, the others are relatively more expensive, and/or can require a more sophisticated owner/shooter to give them the tuning that gets them to perform to their capabilities. Generally, they're finished externally to a better condition than the lower priced bolt actions, of course. But, you have to decide what your priorities are: Looks? Accuracy? Uniqueness? Fast reloading? Price?
Being cheap, with a desire to have an accurate rifle capable of quick second or third shots, keeps me coming back to Savages and their "Tupperwear" stocks.