We've (wife and I) attended two Trainfests (West Allis, WI) and two Big E's (Mass.) over the past dozen years or so. We've also attended York meets twice a year for the past 10 years.
So, in answer to your question, I'd recommend going to Trainfest at least once to make your own evaluation. It'll clearly be a less expensive trip (not counting train purchases, of course!) than going to York, PA. But we found the show to have its own attraction for a model railroader. Besides, it's folly to think that observing other scales...products, layouts, operation, techniques, etc...holds nothing of value or application to the O3R/O2R end of the hobby. We enjoyed the layout displays at Trainfest in particular. Although it was many years ago, one chap had a l-o-n-g narrow trolley layout that was simply a work of art, for example. I don't recall the scale, and I have no interest in a trolley-only layout myself. But, the structures, scenery, operation?.......absolutely exquisite!
Big E? Also a huge event worth going to at least once, if you live some distance away. We'd go again for sure were it not for the fact that it occurs in January, one of the WORST times of the year to be traveling through western New York into Massachusetts, coming from Michigan!!! And, now, of necessity must plan to include the use of an RV when travelling to these shows......another downer for travel in winter!
The changes (decline?) occurring at York have my wife and myself thinking about looking at alternatives more seriously. IOW, even though York is a unique concentrated event for toy trains/tinplate, maybe to breathe some fresh enthusiasm for 'train shows', in general. we need to plan to travel to new shows....at least once....maybe even farther afield!
But, if you choose to do so, yourself, I'd suggest keeping an open mind about what to expect, don't expect the show to be on a par with York's special schtick, and try to find the positives in the new experience.
Just a thought.
KD