However, we all know that these mechs are not all made equally. The 60-ton Quickdraw is rarely going to be chosen over the 70-ton Cataphract or 75-ton Orion. The 85-ton Warhawk is rarely going to be chosen over the 100-ton Dire Wolf.
I propose adding a total tonnage limit to these drop decks. You would still pick your Light, Medium, Heavy, and Assault, but it would add the tonnage together in order to determine your total maximum. This limit might be 230 tons. So, let's say that you originally wanted to take an Atlas (100t), Jagermech (65t), Vindicator (45t), and Firestarter (35t) - this adds up to 245 tons, meaning that you would have to drop 15 tons. So you switch your Atlas out for a Stalker (85t). Alternately, you could switch your Jagermech out for a Quickdraw (60t) and Firestarter out for a Commando (25t).
Here's why: Mechs near the top of their weight class are nearly always better. This is most noticeable with Lights and Assaults, slightly less noticeable with Heavies, and even less noticeable with Mediums. Why:
- With Lights, you are nearly always speed-capped because Lights are fragile. Small engines are disproportionately heavy - the maximum XL engine on a Commando (25t), for example, weighs 4 tons less than the maximum XL engine on a Firestarter (35t). This translates into an extra 6 tons worth of weapons, heat sinks, and armor. Also, the lightest Mechs like the Locust and Commando are disproportionately fragile for their weight class.
- With Mediums, you either fall into the "fast" category or the "slow" category. Fast mediums (low tonnage) go very fast and are fragile - they behave more like light mechs. Heavier mediums (the "slow" category) are less fast and less fragile - they behave more like fast Heavy mechs, except that they are still Mediums so they don't take away from mechs in that weight class.
- With Heavies, you want to cram as much firepower as they can onto their frames, which favors heavier mechs, as they always have more available tonnage.
- With Assaults, you want to cram as much firepower and armor onto their frames as possible, just like Heavy mechs.
- Except for the very lightest mechs, there isn't much size difference between mechs in the same class; you don't gain any sort of bonus to hiding behind buildings or presenting a smaller target.
- Due to the way that the speed calculation works out, you always have more available tonnage by using a heavier mech. For example, an XL 360 engine in an Atlas (100t) costs you 23.5 tons (40t std); to go the same speed in an Awesome (80t) using an XL 290 engine costs you 15 tons (23.5t std). This is a difference of 11.5 tons (3.5 tons using std engine) favoring the Atlas. The lighter mech is only favored when you want to use very heavy standard engines (greater than 375 rating).
- More tonnage means more internal hitpoints. Even if the mechs had exactly the same weaponry, armor, and speed, the mech that weighed more would be superior.