The signal strength should be the same for all customers, Verizon or TracFone.
As to the coverage, you will have access to all of the Verizon networks (SID's) around the U.S. along with some roaming coverage off-network.
Regarding Mobile Web, should you purchase a phone model that includes it, I was told in another thread that it will work on all Verizon networks, but not on the roaming carriers.
America Movil/Straight Talk/TracFone customer since 2004.
verizon customer since 2012.
T-Mobile customer from 2005-2014.