Transformers questions by newbies, and not-so-newbies

[Autocon]

Thanks guys. I've got Megatron, Tigerhawk, Cybershark, Spittor, Scarem, Dinobot and Cheetor in TM2. I'm planning on getting all the ones who appeared in the series which just leaves Optimus and Blackarachnia. Also have Optimus Minor on hold with Verno.
Want to balance my collection out but doesn't seem like it's going to happen if no Mega Predacons. So; Nightglider or Stinkbomb?

NG comes with a sword
SB has no weapon apart from his tail whip

Theres also sonar but it is a bit strange

Why not both?