ROTH IRA - yes please - to decrease and potentially avoid the Medicare surtax relating to net investment income:
A Roth IRA may be able to help limit your exposure to the Medicare surtax on net investment income. Your qualified withdrawals from a Roth IRA are not included in the adjusted gross income (MAGI) threshold for the surtax. However; withdrawals from traditional accounts such as a workplace retirement plan (traditional 401(k)/or a traditional IRA) are included in MAGI and do count toward the MAGI threshold for the Medicare surtax. Your required minimum distributions could expose you to the Medicare surtax, and using your Roth account may help you avoid it.
https://turbotax.intuit.com/tax-tips/health-care/will-medicare-medicaid-be-impacted-by-aca/L11RbMzg5