<ol>
<li>Whichever subject you are least interested in will be the hardest. Although it is generally accepted that Nuc Eng/Chem Eng are the hardest.</li>
<li>If your only interested in money for becoming an engineer, you are doing it for all the wrong reasons.</li>
<li>Same thing as 2.</li>
<li>Colleges with PE are somewhat limited to those in Texas and Oklahoma. Nuclear Engineering is also limited too, usually at the higher end engineering schools – most have removed it from their curriculum. Chem Eng programs are mostly everywhere.</li>
</ol>