There is absolutely no way that the TDR can use up enough SRM or MG ammo to avoid blowing the 'Mech up if one of them does get hit. The MGs are a significant part of its "up close and personal" firepower, without adding heat. The SRMs are marginally more useful at short or medium range, but build heat, and I'd generally rather use the lasers instead of the occasional situation where you get both SRMs to hit. Dump the SRM ammo if you feel the need, but not the MG ammo. Personally, I'd keep the ammo for both and take the risk. The TDR's ammo is pretty well padded with other items, so it's not as bad as it seems at first glance, but it's still a potentially fatal vulnerability.
As said, the CFT only has ammo in one location, but it's got minimal padding for that ammo, and therefore practically as much chance of exploding as the TDR until the late stages of the fight, when the CTF may have used up the ammo in at least one bin.
As I said earlier, I'd give the TDR marginally better odds, but still close enough to a draw that I chose the "even" outcome.