In my mind, this is the best option for startup bookkeeping right now. It's already pretty good, and bound to only get better as more of it gets automated. To my pleasant surprise, the (human) team was very responsive in answering questions or addressing concerns as things popped up.
- Automatic daily import of bank and financial transactions into Google Sheets with powerful templates to get you started (or build your own). Money management pretty much always ends up in spreadsheets one way or another - Tiller removes the tedium of manually importing bank and credit card CSVs etc. Tiller's new AutoCat Docs Add-On categorizes expenses directly in Sheets based the rules you set.
- QBO is super easy to use, includes payroll and invoicing, and has integrations with everything you can think of. We use QBO with ReceiptBank so nobody ever has to manually do expense reports, and it's natively plugged into our payments processor.