I have been both flips and rental properties since 2000 in the Seattle market. If I were starting all over again, I'd follow the advice of what my mentor has told me over the years. Wholesales/flips are an S-quadrant job, while cash flow rental properties are an I-quadrant investment.
If you have money already, the best advice is to start with cash flow properties where your passive income exceeds your expenses. If you don't have enough capital, I'd start with wholesaling.
It's great that you have a construction background. I was a general contractor and finish carpenter and so flips made sense. Regardless of my construction background, I still lost a lot of money on my first flip. Lost over $100,000. If you flip, do a small project and don't go big. If you flip, make sure you factor in holding costs such as utilities and mortgage payments and purchase and selling closing costs. In flipping, you've got to nail the After Repair Values (ARV)
If you don't have a lot of capital to buy cash flow rentals, I would go for wholesaling. We have our target market dialed in where we send out 100 mailers and get 10 calls and one deal under contract. On BP, it seems that most are sending 1000 mailers to get one deal under contract. I would wholesale first to learn the business and flip every 1-2 "home run" deals for every 20 deals wholesaled.
Finally, for both rentals and flips, the most important advice is to know how to analyze the deals property. For rentals, learn how to correctly calculate cash-on-cash return using the Pre-Tax Cash Flow numbers that include the Annual Debt Service. For flips, learn how to correctly calculate the ARV and the construction costs.
It doesn't seem like a popular theme on BP but I buy my cash flow rentals in other areas of the country from turn-key flippers. They rehab the property and do the property management and I get a 16% cash-on-cash return with 20% down. In my market in Seattle, the cash-on-cash returns are usually below 7% and so I no longer buy rentals in Seattle. In Seattle, I wholesale, flip, and develop.
Best of luck!