Hope that TT plays great for WF, but they appear to be very similar players to me, but giving the nod to Thompson as a slightly better offensive player (McClinton was at least an average defensive player).
McClinton and Thompson are two months apart in age (Thompson is two months older). McClinton is listed a 6-7 200; Thompson is 6-7 215. They were both HS class of 2013. McClinton was the #8 player in NC and #139 in the nation. TT (from Durham) was not ranked in any HS recruiting ranking that I could find. Neither are a threat to score from the outside. In 2016, both played similar minutes at their respective schools, and even though McClinton played significantly better competition in the ACC, their numbers were similar: McClinton: 37-68 from the field; Thompson: 38-78 from the field; McLinton shot 57% from the line; Thompson shot 54%; Thompson rebounded better than McClinton, but again, Thompson is rebounding against C-USA talent; McClinton ACC talent.
Marshall plays in the C-USA, which is now an awful basketball conference, dominated by MTSU (yes, MTSU) over the last two years. To give an idea of how bad the C-USA is now, the Summit League, Southern League, the Horizon League and the Ivy League are all higher rated conferences. Don't think it would be a stretch to have Greg McClinton put up similar numbers for Marshall than what Thompson has posted over the last two years. FWIW, thought that McClinton could play a role in this season's team, and I am confident that TT will play a role too.