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If you're actually bedding an action or barrel, the gel type is better because it won't run out like the original type did.
You'd bed the action and when you removed it you'd find the thin Acra-glas had run away from the area you wanted it and would leave voids. Then you had to apply more epoxy to fill and repair the voids, and clean up all the mess of the runs in areas you didn't want it.
With the original thin type it was not unusual to have epoxy dripping out the magazine well.
The gel doesn't run as easily and tends to stay put better so it's better for actual bedding.
For use as a glue, the thinner old type is better because it gets into small areas better. The gel type is too thick.
Ordnance type stock repair pins are fairly easy to use. The only trick is to drill the hole so it passes through the crack in as strong a position as possible. You don't want it too near the edge of one side of the crack to prevent the area from itself cracking later.
Run your drill at slower speeds when drilling to better control it.
I haven't used the Brownell's pins, but the older Ordnance pins were drilled with a slightly smaller drill bit.
When the pin was screwed in, it actually pulled the crack together. Done this way, no glue was needed but is a good "belt and suspenders" method to use the thin epoxy.
I've also used brass wood screws which seem to pull the crack together even tighter. However, finding very small diameter, long brass wood screws is tough.
