Suggested by iKnowledge Quinlan Vos has certainly proved himself a lot more than Lomi has. Lomi has had some good fights over the years like when she took on Luke Skywalker and when she managed to trick Anakin, but ultimately she hasn’t done a whole lot. She has had less time to really show off her capabilities while Quinlan has been fighting for quite a while now. He’s really shown why he is a top notch fighter. His mastery with the blade is quite impressive and he can also manipulate the Force with ease. Ultimately Lomi won’t be able to stand up to his sheer skill with each technique. Quinlan Vos wins.
DReager1.com 
I think you have the wrong image for Lomi Plo, might I suggest this: https://images-wixmp-ed30a86b8c4ca887773594c2.wixmp.com/f/0bb54c41-81bf-44e3-b44c-631ab174de4b/d7f4859-e22423f4-c513-47f6-9a97-007750ed7f5a.jpg/v1/fill/w_957,h_835,q_75,strp/lomi_plo_by_disstrack-d7f4859.jpg?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJ1cm46YXBwOjdlMGQxODg5ODIyNjQzNzNhNWYwZDQxNWVhMGQyNmUwIiwic3ViIjoidXJuOmFwcDo3ZTBkMTg4OTgyMjY0MzczYTVmMGQ0MTVlYTBkMjZlMCIsImF1ZCI6WyJ1cm46c2VydmljZTppbWFnZS5vcGVyYXRpb25zIl0sIm9iaiI6W1t7InBhdGgiOiIvZi8wYmI1NGM0MS04MWJmLTQ0ZTMtYjQ0Yy02MzFhYjE3NGRlNGIvZDdmNDg1OS1lMjI0MjNmNC1jNTEzLTQ3ZjYtOWE5Ny0wMDc3NTBlZDdmNWEuanBnIiwid2lkdGgiOiI8PTk1NyIsImhlaWdodCI6Ijw9ODM1In1dXX0.nJrmIg78iYWsMvanYEcx93LKM4cfivIO5XrB84f_6ss?.
But enough of this. I wouldn’t underestimate either, given how Quinlan would be a century old by the events of the Dark Nest Crisis. And if Lomi Plo lost to somebody more powerful than Old Republic Jedi, then it will be one tough battle.
Yeah it was tough finding a pic for her. I saw that image you mentioned but it seemed like fan-art and I couldn’t find who drew it originally to give the author credit before posting it. Lomi definitely had some good fights under her belt. I think with more screen time she could have pulled out a win