You may want to get more feedback from the thread before applying.
But to part of your question:
Conventional wisdom says double dipping a business card and a personal card on the same day does not combine hard pulls; Chase will pull credit reports twice for the business line and the personal line of credit. So there's not really any advantage to applying for the Marriott business and personal cards on the same day other than it'll get you two cards in hand at or about the same time.
You can apply for the Marriott business and personal card on the same day if you can manage the combined minimum spending requirements, or space out the applications, but
you should apply for the Marriott business card first, especially if you plan on applying for two Marriott cards on the same day or within 30 days.
Apply for the Marriott
business card
first because Chase has an informal 0/30 rule that denies approval for a business card if you've had any other credit card applications with Chase in the past 30 days. If you apply for the Marriott personal card first, that would count as 1/30 and push your business application out another 30 days. Make sure the business card is approved before you go for the personal card. If you aren't auto-approved and perhaps got the we'll let you know in 30 days message, call the automated status line at
1-800-432-3117 after an hour to check the status of your application. If you still aren't approved, you could either wait it out to see if you'll be approved within the next few days, putting your Marriott personal application on hold until then; or call recon at
1-888-270-2127 to get the Marriott business card approved. If you call recon on a business card application, be sure you're comfortable about the possibility of talking about your business.
Start applying early during regular business hours of a non-holiday weekday in case you need to call Chase reconsideration or verification departments. For Chase business cards, it's typical to get a "we'll let you know our decision in 30 days" response to your application.
After the Marriott business card is approved, then go for the Marriott personal card. If you are applying for a second card on the same day, use a different internet browser or an incognito window for the second application, otherwise Chase may combine the apps thinking they're accidental duplicates. If it isn't auto-approved, call the automated status line after an hour. If you still aren't approved, you can keep checking the automated status line and wait it out, or call recon to get it approved. Chase has an informal 2/30 rule that limits you to only two applications every 30 days or else you’ll be rejected automatically.