401k solo or SDIRA for next investment property

[Josie W.]

I currently have a traditional IRA with 150k approx. I currently have 3 rental properties cash flowing. First and second property SFH equity $90k, approx. 3rd property $160k I bought it with a home equity loan on my residence. $130k loan value.

Thinking about reducing taxes and fees, would it be better to get a 401k solo or a SDIRA or should it be better to get a conventional mortgage with current rates.

I don't know much about 401k solos or sdiras but I am learning and I am willing to make the change if it would be the best choice.

Thank you