You quote homeowners. ServiceTrade quotes facility managers.
ServiceTrade's whole pitch is asset history per piece of equipment, deficiency tracking, code-compliant inspection reports, and pull-through repair revenue from preventative maintenance - all of which are commercial workflows (source). On a homeowner job, you don't have a facility manager who needs an asset history report. You have a customer who wants to know 'is it $400 or $4,000?'
You need a price. You get a quote-based sales call.
ServiceTrade pricing is custom, with three tiers - Select, Premium, Enterprise - and you have to call sales (source). CurbBid is on the homepage. One flat price, no call required.
You quote in driveways. They quote in boardrooms.
ServiceTrade's proposal engine is built for multi-asset, multi-page commercial maintenance agreements with labor and parts pricing engines. For a residential plumber sending a 'replace water heater' quote, that's a stadium for a pickup game.