here goes: you should or you could i dont consider much of a difference cause i am the only authority on MY computer and am stating my experience. what anyone else should and will do is solely up to them and no one else, even if venerable linus torvalds or anyone else of the gnu gurus themselves posted something, its just a plain advice one can follow, implement or not after being satisfied with the results or not. i hope that clarifies MY opinion and relevant advice i stated with full freedom, same as anyone else here. if i was using the older machine, as i have, than i may have noticed the poor performance of konqueror over other browsers. this involves flash and the rest (talking out of the box, since one can even teach a donkey to sing and talk like a human with enough time and will to do it).
about the konqueror problem youre having in regard to staying logged in, maybe your cookies settings are done awkward. save session cookies in order to stay authorised to anything, mail, web page requiring it, this forum.
about the security and user habits tracking (data mining), for one, i shall say the obvious, and this i have said LONG ago on this forum:
this forum log in page has HTTP only enabled, no security in a way of HTTPS, like mail servers have, same goes for facebook, for example.
about anything else, disallowing cookies, using tunneling like vpn etc should do the work, regardless of browser, and there are quite a few ways to have quite nice low flying comm over the net.