EX srk is the one I use the most, and I use that against anyone. I also use EX hurricane a lot, mainly for punishment (cr.mk x ex hurricane, st. close mk x EX hurricane, etc). I really find all his EX moves pretty useful, and not really in a character specific way, I use them against anybody.
As far as your second question, Im always cautious when fighting a fully stocked shin shoryu ryu, at least until the person proves they dont know how to use it. If I see someone just throwing it out randomly, then of course I dont fear it, and will use it to my advantage, baiting out the random super and punishing with my own. Now your join date says 2002 so Im gonna assume you know how to combo into it:lol:
Ryu SA1 vs SA2 is one of those cases where each has their own distinct advantage (flexibility and of course EX moves for #1, massive damage for 2). Either way youre making a sacrifice, its all about which sacrifice better suits you.