I run outbound for 50+ clients across every major B2B category.
The fastest way to find out if your message lands is not ads, not events, not LinkedIn, not calling.
It's cold email. Every time.
Ads: expensive data. $50-100 per signal before you know anything.
Content: 6-month feedback loop. You'll be dead before the post compounds.
Events: good luck A/B testing your copy at a trade show.
Calling: too many variables. Rep quality, tone, time of day.
LinkedIn: sending limits kill your sample size before you get statistical significance.
Cold email gives you message-market fit in 2 weeks at a fraction of the cost.
It may not be the best channel long-term but, it's the best test.
Everything else gets easier once you know what lands.