I would lean towards Mathis then if we have to choose between those two options!
reasons being conger cant hit from either side well and Mathis since 2014 seems to have figured out LHP somewhat at least.
Plus he is a ex Jay so he may not object to coming to Toronto.
plus his stat line from sss in the dome from that year of 110 at bats,17 r, 31 h, 9 2B, 5 HR, with a .282 ave, .319 obp, 500 slg , 819 ops seem interesting
plus he only cost 1.5 mil just last year same as conger so it a tie there.
so i give the edge to Mathis since he is easier on my eyes!!!! lol