Which is worse (overall): WBIX or WNSH?
If you are talking about signal or more accurately, signal for the power, WNSH has, hands down, one of the worst daytime signals for the power of any AM station in North America. Still, because of the location (near salt water), the signal has some bright spots--particularly Cape Cod, essentially all of which WNSH covers like a local. The path from Endicott College to all of Cape Cod is nearly 100% over salt water.
WBIX has a very good daytime (and critical hours) signal over most of the market. WBIX holds a CP to increase its daytime power from 40 kW (non CH)/22 kW CH to 50 kW all day. This would be accomplished by moving its day site from 100 Mt Wayte Ave in Framingham to Sewell St in Ashland, which is also the 2.5 kW, five-tower night site. The day pattern would be identical to the existing night pattern, just with 20 times the power. The result would be a loss of coverage in central Mass, southern NH, southern ME, and southern VT. There would be some improved coverage in southeastern MA, though. However, because of the long salt-water path from New York City, the signal in SE MA would be impaired by interference from first-adjacent WEPN. The FCC has a long-standing policy of allowing New York City stations to interfere with New England stations in the area east of Naragansett Bay.
It remains to be seen whether the new owners will build out this CP. Rumor has it that they have very tight budget constraints and building out this CP would almost surely cost more than $250,000, even though no tower construction would be required. Moreover, the loss of coverage in central New England might reduce, rather than increase, the station's value. That loss would be offset, however, by the need to lease only one transmitter site instead of two.