As a wholesaler, hopefully hearing from some of you with experience with these sites, what are the advantages or disadvantages of each of these sites respectively... as far as which search criteria to use on each platform?

From what I read in Bloomberg recently, investors gravitate towards platforms they trust on a personal level.I’ve found that blending personal touches with strategic growth means knowing your audience and what makes them tick.

BUT maybe think about freshening up the exterior of your STR (Airbnb is a platform).I work for Airbnb as an "Airbnb SuperHost Ambassador". 

Welcome Anthony, BP is a great platform to learn and connect with other investors!

I have a similar perspective, as I am right on your heels with the same decision, so I'm naturally inspired. 

Most productive leasing platforms?

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Firstly, well done for persevering and trying every avenue you thought would get you the data you needed.Most would have caved earlier and handed out there hard earned cash for old, saturated leads/records from the same prominent platforms which dump them pretty much when they receive them from either 1).the same large brokers AFTER the county has listed them on the county website or, 2). from the counties themselves directly AFTER the county has listed them on there own website, or, 3). from data scrapers on Upwork/Fiverr who scrape the data from those same platforms AFTER the counties/brokers sell those platforms the data being scraped by the freelancers.Anyway, rant aside you seem to of made the same mistake i made when I first started branching out away from providing leads to my original couple of clients i got from Upwork who wanted me to scrape data from court records in FL for pre FC leads.Simply, I didn't know where to look for the information I needed in states outside of FL.FL only allows the judicial route to foreclosure so I only needed to know/find/scrape the data from Lis Pendens documents for counties they requested.

Is there a platform where I can advertise a pool of mortgages for investors to buy/invest in?

I think you will find everything you need on one platform and happy to get you a free tour of the website