The verdict
Start with Google Analytics. Without it you cannot say which channel brings the visitors that convert, and it connects with Google Ads, Search Console and Tag Manager. I'd pick it first for nearly every small B2B team. Add Albacross when you sell to a defined set of companies, your site gets steady traffic and sales would act on the signal. Skip Albacross if traffic is small or mostly consumers. Skip Google Analytics as your only tool if you need deep product analytics or detailed funnels. It will not name a visiting company, and Albacross will not tell you which channel performs.