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Close forces you to use its autodialer and VoIP, which only makes sense if nonstop phone outreach is your team's main thing, while Salesforce is only a fit if your company is huge.
Only use Close if you need that autodialer above all; skip Salesforce unless you have at least 1000 employees.
If your sales team is all about high-volume phone outreach and you live and die by the autodialer, Close is built for you. Its native calling, SMS, and power dialer features are designed specifically for aggressive outbound sales. But if you aren't running a call-heavy sales motion, Close's rigid communication setup and lack of flexibility will get in your way fast.
Salesforce isn't even in the running unless you're a massive enterprise with complex business processes and a huge budget for consultants. For everyone else, it's overkill and way more than you need.
So if your primary goal is dialing at scale and phone outreach is your sales team's bread and butter, go with Close. If you're not that kind of team, neither app is a great fit, but definitely don't pick Salesforce unless you're running a thousand-person operation with deep pockets and a need for heavy customization.
