Hello vikramaditya

The answer is "not really" they are all as good as their last update and their unpatched exploits

As these vary month on month, the answer will change accordingly?

Academically speaking, any browser with ActiveX and Java turned off will be more secure than those which support them. As they have frequently been used as an attack vector.

Please remember that we are largely talking "security through obscurity" (people have not looked for holes......yet) rather than any inherent design superiority.

The weakest link is between the keyboard and the chair?