Yes, both Microsoft OneDrive for Business and Dropbox Professional offer a Free Trial.
Microsoft OneDrive for Business is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Dropbox Professional is designed for and undefined.
Pricing for Microsoft OneDrive for Business Starts at $1.99 whereas for Dropbox Professional Starts at $9.99/Month when Billed Yearly.
Some top alternatives to Microsoft OneDrive for Business includes CollaborateCloud, Microsoft SharePoint, Onehub, ShareFile, Dropbox Business, FileCloud, Box, Citrix Content Collaboration, imDocShare and Microsoft 365.
Some top alternatives to Dropbox Professional includes CollaborateCloud, CloudFiles, Dropbox Business, FileCloud, ownCloud, MyDocsOnline, FilesAnywhere, DocUp, etfile and Dropbox Paper.