The Bomarc would probably have had a significant edge over the SA2 as the latter were likened to a telegraph pole with a smoke trail. As the Bomarc, like Bloodhound and Thunderbolt, used ramjet propulsion after the initial launch it would have been less noticeable. It may have had contrails however.
The Nike Ajax was probably very similar in capability to the SA2 but the later Nike Hercules would probably have had the same advantages as Bomarc.
While AR1 was right to respect the 1991 version of the SA2, this was a quite different beast from the 1960 model. The latter, set up in clutches of 6 on single rail launchers was a relatively unsophisticated SAM. Once it was upgraded to counter low level penetration and mounted on quad launchers to counter the mass bomber raids in Vietnam, you are talking a different missile.