Mishra SK, Sivaraman B, Balachander H, Naggapa M, Parida S, Bhat RR, Yuvaraj K. Anesth Essays Res. 2015 Sep-Dec;9(3):353-8
60 patients were enrolled to either i-gel or ProSeal groups, with the primary objective to compare sealing pressure. Authors conclude ProSeal gave a better seal.
Link to abstract