Ive only used the sl2 so can't comment on alternative poles, but sl2 is incredibly light, can use 1 handed at height (though ive only worked at 50ft).
Modular poles can be a pain at first, but like anything you get quicker with it. I've left sections behind several times.
Another very good thing about the sl2 that if you break or snap a section, you can slip the broken pole through the other broken bit and glue it up.
Also, having a pole that extends height opens up all sorts of possibilities of new work that you can do.
The advantage of using your heavy brodex pole is that you can work with it in strong wind without much bother. The sl2 is so light it wants to blow away.
SL2 has been a great asset to me.
It has got me 1 job that covers my tax bill each year.