Here are three stocks with buy rank and strong value characteristics for investors to consider today, May 20th:SPAR Group, Inc. (SGRP) : This merchandising and branding company carries a Zacks Rank #1, and has witnessed the Zacks Consensus Estimate for its current year earnings increasing 416.7% over the last 60 days.SPAR Group has a price-to-earnings ratio (P/E) of 6.16, compared with 27.60 for the industry. The company possesses a Value Score  of A.PetIQ, Inc. (PETQ) : This pet medication and wellness com ...