honestly, each of those chassis are good at different things, the Cicada is obviously good at being mobile and excels at intercepting lights, scouting duties, harassment and flanking. Its kinda squishy so you must play careful, hillhump, focus fire, watch your groups flanks and intercept lights, brawl if you have the advantage but don't chase 'em unless the game is almost over. The
CDA-2B is fantastic for this.
the Blackjack excels at fire support, mostly because of the limitations of the chassis'. All but one of the variants are slow and can't really solo brawl very well and so ideally, should be near the main group to avoid getting overrun. The BJ-1X is ok for flanking providing you are backing up other mechs.
The Crab is sturdy, even with an XL, and can go pretty fast. In my opinion, it makes for a good flanker and harasser. With its low stance and surprising speed, (with a big XL), it can maneuver around maps pretty well. Alternatively, you can run a standard engine and be difficult to put down. It's easy for the enemy to identify if you're a standard or XL crab and so you must be cagey if you're running the XL. The extra speed the XL engine provides does helps mitigate the vulnerability some.
The Cicada and Blackjack both have more advantageous hardpoints and peek much better, the Crab usually has to commit to full exposure to deal maximal damage.
I personally prefer an XL in my Crabs and use the speed, low profile and cover to compensate. Recently had a game where I was the last left vs three other mechs and when they finally put me down with a ST loss, the guy who did it crowed a bit, essentially calling me a noob for not running a STD engine. The Crab does well with a XL, don't dismiss it out of hand. You are in ways more vulnerable, but their are advantages to doing it and if you adjust playstyle accordingly, it won't be a problem at all.
CRB-20
Edited by Nullmancer, 19 November 2016 - 11:58 AM.