Ink Business Unlimited vs. Spark Cash Select: Which simple business cash-back card wins?

As a business owner myself, I've spent more brain power than I'd like to admit thinking about which credit cards can help me get more out of my business spending.Two cards that often come up when you're looking for a simple, no-annual-fee business card are the Ink Business Unlimited® Credit Card (see rates and fees) and Capital One Spark Cash Select — and it's easy to see why they're competitors.Both keep earning simple, offer tools and benefits for business owners and don't charge an annual fee. At the end of the day, though, the Ink Business Unlimited has an edge for most business owners, especially if you can pair it with an eligible Chase Ultimate Rewards card.I've already put more thought into business credit cards than any reasonable person should, so let me break it down for you.Ink Business Unlimited vs. Spark Cash Select: At a glanceInk Business UnlimitedCapital One Spark Cash SelectAnnual fee$0$0Welcome bonusEarn $1,000 cash back after spending $8,000 on purchases in the first four months after account opening.Earn a one-time $750 cash bonus after spending $6,000 on purchases within the first three months from account opening.Employee card fee$0$0Base earning rateUnlimite...