$4k a month or own a 4 unit multifamily property worth 4.8x the STR but just breaks even month.

Here are the details. You have approximately $100k to put into a property. Property A is a Short Term Rental investment property that's selling for $300k. You have a very similar property now that makes roughly $4k a month in cash flow so you're considering doubling up and purchasing another one in the same area. You would most likely put 20% down and be able to get this property as an investment loan for say roughly 4.5% interest rate on the high end. For this discussion we're going to assume that you can get it to cash flow at $4k a month similar to your other STR.

Property B is a 4 unit Multi-family selling for $1.45M that you can get with an FHA loan for 5% down at $72k and most likely an interest rate of say 3.5%. You will live in one of the units and with the rent from the other 3 units you will just break even each month. This breaking even each month is however a cost savings to you though as you will save money from the rent you're currently paying each month.

So in summary, would you rather have a Cash Flowing Short Term Rental that makes you $4k a month or a 4 unity multi-family that runs at break even? 

To try to make a fair comparison I'm looking at the cash flow value from Property A over the course of 30 years. I'm increasing the cash flow by 3.25% each year to account for inflation. I'm also assuming I'm going to save every dollar from that cash flow over the next 30 years which if my calculations are correct would be approximately $2.3M without any interest being generated from the savings account I'd be using. I know what your saying. There's maintenance and property management and other non fixed fees that come up each year which I have taken into account already and I'm just looking at this $4k in cash flow each month. I'm also going to include the overall property value which if I purchased it at $300k in 30 years at 3.5% increase in property value should be worth roughly $814k. So hypothetically in 30 years Property A has generated $2.4M in all time cash flow and is now valued at $815k for a total value of $3.2M. 

Now let's compare that to the 4 unit Multifamily that breaks even every month. If it's current value is $1.45M and we can average that property value will increase by say 3.5% over the next 30 years that property would be valued at roughly $3.9M. I know rents will also increase and so hypothetically the property will eventually cash flow but for the sake of this "Real Estate Would You Rather" we're just comparing the property value of a break even multi-family over a high cash flow short term rental. 

So... Would you rather own the cash flowing short term rental or the high value break even 4 unit multi family. Which would you choose and why?