TA/DP defender or DP/TA corrupt?

You have three things to really consider:

1. Debuff values;

2. Scourge; and

3. The order in which you take your powers.

Both of these toons will be very, very decent, doing respectable damage and bringing a fair amount of utility to the team. A lot of people complain that trick arrow's debuffs are underwhelming and, to be honest, there's a glimmer of truth to that. Compared to other sets, your TA debuffs will do less than say radiation emission or dark miasma. That said, every single power you have as a TA/DP or a DP/TA is essentially a debuff when you swap ammo. As a defender, poison gas arrow and various chemical ammo shots are going to reduce the incoming damage noticeably. Teams will have nothing to complain about when there is less incoming damage, and that aura-rocking emp with likely find themselves being asked, "So, what is it you're doing here?" (this is satisfying). If you primarily want to team and focus on your debuffs, go this route.

On the other hand, the corruptor path is all sorts of fun. Fun, however, does not equate to being easier. Your debuff values are lower, and you're going to get one of your set defining powers (oil slick arrow) six levels later than your defender counterpart, although in exchange you get hail of bullets sooner than they do. Is it worth it? Mmmm, I dunno. As soon as I got OSA, everything changed -- I became an engine of destruction that garnered many a "Whoa..." from my teammates. To be entirely fair, though, I was lighting it with hail of bullets and incendiary rounds, which is pure joy and hilarity. The corruptor version of this power combo will rely more heavily on ice arrow, stunning shot (which, when using swap ammo, becomes a hold rather than a stun), glue arrow, and entangling arrow (which isn't as underwhelming a tier 1 ability as many think it is) until you get OSA, but it's still ridiculously safe solo toon that can bring quite a bit to a team. Your inherent, scourge, will level out the damage between 32 and 38 until you get that wonderful arrow.

Personally, I would go with a corruptor. There are a lot of powers that you really need to take from both of these powersets (or if you find 'need' to be an inadequate term, 'want' may be a suitable alternative. You really do want to take almost all of the powers you're able to). There really is no choice between entangling arrow and flash arrow -- you're going to take them both. For a character that has no means of healing himself without taking additional power pools, both of these will be essential for your survival. The clincher for me was actually in pistols. It's not an awful tier 1 blast power, but it's not all that useful at higher levels. As a corruptor, you can take it initially if you want, and then respec out of it later in favor of executioner's shot. Defenders are forced into it.

Overall, I would put my money on the corruptor version of this powerset combo. As scourge procs, you'll see your damage outpace the defender's. Even though their debuffs are better, yours are still no slouch. In all honesty, I think it's the choice of taking pistols which broke the camel's back for me, which is actually kind of sad...

Regardless of which you choose, the ability to mitigate the incoming damage is going to be essential for survival. You will need the following TA powers to survive long enough to get to OSA:

Entangling Arrow -- the enemy doesn't move!
Flash Arrow -- the enemy doesn't see (well)!
Ice Arrow -- lulz, block of ice.
Glue Arrow -- bitchez be slowed (but together, like a family)
Stunning Shot (combined with swap ammo is a hold) -- that's right, Penelope, you're going to hold bosses.
Acid Arrow -- who are we kidding? Debuffing defense is crucial.

Which would make zero sense. There's nothing wrong with the redraw. If it bothers you that much, don't play it.