User blog comment:Astrotorical/Tahnok vs. Droideka/@comment-422690-20120228101125

I'm voting for the Tahnok on this one. The Ca, you forgot to mention, can shield others, meaning that in addition to its stronger attacking capabilities, it can serve a support capability to keep the squad leader from harm. Now, I am not sure of the power of the Ca's shields, but they seem to be about equal in power to a Droidekas, if a bit lower. Droideka shields can stop their own blasters, so I think the Ca's shields will stop them.

The Fire Shields, on the other hand, have "the power to generate intense heat and/or flame, allowing it to melt through virtually any substance on the island of Mata Nui," (Bionicle WIki),which includes rock and metals. We have seen that the Droidekas' shield can be overloaded, so something that unleashes this much energy will most definitely overload their shields. So, the Tahnok have an advantage offensively and defensively.

Mobilitywise, the Droidekas are limited thanks to their tripedial design, plus non-articulated "Arms" that only function as blasters; the tripdial design works for a stable firing platform, but if a Droideka is knocked off balance there's not much it can do to regain it. Tahnok have more mobility, as they are bipedial, and can keep balance better due to their more articulated arms (yes, arm movement matters a LOT in balance. Try walking on rough terrain while keeping your arms perfectly still; you'll see what I mean). This gives the Tahnok an advantage in mobility.

Also, averages for X-Factors: Tahnok: 81.2, Droidekas: 73.2, edge going to the Tahnok for the 8-point advantage.

Overall, the Tahnok (who, BTW, I consider the second-weakest of the Bohrok) have an overwhelming advantage here. The Droidekas are, quite simply, outclassed. If they didn't rely on their shields so much...