Here are my suggestions for mechs to bring to CW and to use at other times as well.
First up is the Mauler. I personally prefer the 4x UAC5 build on the 1R or 1P because it can dish out UAC5s up to 660m with less than a second for cooldown (without double-tapping). However, the MX90 can also do the same build but with a slower cooldown but longer range and faster velocity. Another option with the MX90 is 5x AC5s, it's 25 damage at over 775m.
Keeping with the dakka theme, you can bring jagermechs but be careful since skilled people will always go for the right torso and with an XL engine, you will die very fast. Play carefully and you'll be good. The build I love is 3x UAC5s on the DD since it has the quirks for it.
Moving on to laser mechs, first is the Stalker 4N with 6x Large Lasers. This is VERY good at tanking and has very high hardpoints but if you lose one side torso, that's half your weapons gone. It is also quite slow topping out at 61kph with speed tweak.
Next in the lasers is the Battlemaster 2C with 3x Large Pulse and 3x Medium Lasers. I choose this vairent because of the structure quirks and can have a very high LPL. This also dishes out the damage to whatever you can look at for about a second. The reasons to take this over the Stalker is because it's faster, 66.6kph and can torso twist to survive and keep it's weapons. Don't take this on warmer maps...
A slightly lighter type of laser vomit mech is the Black Knight 6-KNT with the same 3xLPL and 3xML. You take this over the Battlemaster because you have 10 more tons to work with and it's faster. You can also take both if you truly want to.
Lastly is the Jenner hero, the Oxide with 4x SRM 4. This is over powered so use it. Even without some quirks, it's still super strong so fork out the money and get it.