The Dart Monkey is an early game beast that falls off in the late game. Its main draws are its good cost-to-DPS ratio for lower tiers and cheap Camo detection that lets the player save up for the mid game. In CHIMPS and Half Cash strategies, it's mostly used for its low tier upgrades; its higher tiers are niche.
Very Quick Shots is the best crosspath unless camo detection is needed. The third path's knockback buff to Jugg and Ultrajugg isn't worth losing the extra DPS.
Path 2
Triple Shot is a cost-effective early game option for a handful of maps like Dark Dungeons.
PMFC is good for lategame burst DPS but requires stalling or something to cover its downtime. Use Downdraft or Ice Monkeys to stall Ceramics at the end of rounds to give it more time to recharge.
SMFC and PMFC pair well with Primary Mentoring, improving the fan club monkeys' pierce and range, reducing the ability's cooldown, and giving free tier 1 upgrades.
Fan club monkeys should be upgraded to Very Quick Shots. They can be upgraded on the top path too if extra pierce is needed.
Path 3
Crossbow does decent early game damage but is held back by its slow projectile speed. Place it in areas where it's less likely to whiff.
Sharp Shooter is a decent stepping stone but needs pierce buffs to do well. Unfortunately, Berserker Brew makes it worse since the damage buff causes Ceramics to split into a ton of Yellows.