Most of my research has been geared toward the BRRRR method.

Since the biggest risk in the BRRR method is appraising a rehab, it makes sense to find a job that does just that.

Of which time is the most important part of the trade off, this is Passive.For most people it's not the ability to do it on their own, its the time commitment to makes the decision. 

As a new investor, what is a good company to use for private lending methods?

Look, we have experience with the methods that were listed in the OP. 

Most likely no one will be able to answer this question because no one was buying at 4%-5% caps three years ago, and with most assets being held 3+ years the 4%-5% acquisitions haven’t sold yet.Having said that, 3 years ago when people said it was crazy to buy at 5%-5.5% caps, I’ve since made out pretty well on those trades, some of them exceeding 30% gross IRR on full cycles.

The method I've been using is looking for new construction, specifically of grocery stores (Follow the Walmarts haha) or housing developments.

Hard to say without knowing how much rehab is needed but as a general rule of thumb: If ARV is lower than 250k: 55% ARV minus repairs If ARV is higher than 250k: 70% ARV minus repairsOf course this method may vary depending of the market but it’s a start ;) Good luck !

And if you sell for $300K and buy fo $300K but keep $50K cash boot you pay tax on that difference.Use this method and your potential liability is pretty clear - It's the difference between the amount you sold and purchased. 

What we've done so far is purchase bandit signs (old school method) and plan to put those out this weekend.