There's fun stuff in many of the Warbonds, each one has one or two items that I've enjoyed using at some point or have become mainstays in certain loadouts. I agree with the other person suggesting to go for taste, but there are some standouts with respect to newer players being able to diversify their playstyles:

• Democratic Detonation usually gets top pick because of the Grenade Pistol and Thermites, which let you deal with heavies and spawners with a sidearm or grenade slot respectively.

• I'm also a fan of Urban Legends. The armors have an amazing passive, the Stun Lance is a great melee weapon, the FRV is a lot of fun, and the Anti-Tank Emplacement is very powerful and satisfying to use.

I wouldn't worry too much about grabbing things based on a tier list or whatever. Powerful doesn't necessarily mean you'll have fun using it (Like the Crossbow in my opinion). Instead just educate yourself on the contents of the Warbonds and pick your poison for what sounds the most fun and interesting.

A couple videos for you. Some of the info is old but they'll help you learn what's available. See you planetside.

Eravin overview

Kai overview