The verdict
If you sell to a defined list of companies and your site gets steady traffic, I'd pick Albacross. The signal that a target account read your pricing page three times is something Clarity cannot give you.
If your problem is a landing page that converts badly and nobody can say why, pick Clarity. Watching a few real sessions often shows the cause within minutes, and it costs nothing to try.
If you have no budget and no clear account list, start with Clarity. If you have both, they are not rivals. Many teams could run Clarity as the baseline and add Albacross once sales wants account signals.