Posted 12 April 2013 - 12:33 PM
I pilot a decent amount of lights, and each (of the top variants) has a good role:
Com 2D: Great at filing in and out of fights, and with 3 streaks is wonderful for murdering other light mech. This variant falls behind however when it comes to fighting larger mech, as it lacks the stopping power and precision damage of other lights.
SDR 5D: Amazing maneuverability combined with ECM ability. This mech is great at circling a larger mech to death and keeping off radar long enough to do so. The three laser hardpoints make it good for fighting heavy mech, and the jumpjets give it the maneuverability to slip in and out of fights quickly. This mech has a few problems fighting other lights, but is unfazed by those without the ECM to use their streaks.
JR7 D/F: Great maneuverability, best speed in the game, jumpjets, 6 weapon hardpoints. This mech is almost the best light mech out there except for one thing that makes it lose fights to almost every other light: It has no ECM. Streaks are the death of this mech, it loses almost every fight against a light with streak capability. However, when it comes to fighting mech three times its size, this is the winner. My jenner has murdered countless Jagermech, Cataphract, Atlas, and Stalkers because of its ability to stay out of the killbox of larger mech and use its 30 damage alpha strike without receiving return fire.
RVN 3L: Considered by most to be one of the best light mech. This mech is a perfect balance of armor and weaponry, combining three medium lasers for killing heavies and two streaks for brawling lights. The ECM makes sure its streaks are always active, and its armor makes sure that it can take more hits than any other light. The only conceivable downside is having no jumpjets, but for most this is an easy tradeoff for the other benefits.
I'm not sure I can pick which light is 'best' among these, but it is my personal opinion that the commando is the weakest among them (as the raven can pack almost as many missiles with nearly double the armor). I am personally enjoying the jenner the most, and am dealing an average of 450 damage per match in either variant. The only light I do not own is the spider, so take anything I say about it with a grain of salt, but I have dropped with many good spider pilots who take great advantage of its additional jumpjets.