I am a diocesan priest in the parish of Cyrill and Method in the Archdiocese of Vienna, and a teacher at the St. Alphonsus thinks it not improbable that more grace is given in Holy Communion under both species, and all theologians agree that if the ardour of charity is increased by receiving the second species, then greater grace is conferred accidentally by reason of the better disposition. Therefore a layman who wants to become a priest in order to communicate under both species so as to receive this greater grace is not to be dissuaded. (Garrigou-Lagrange, The Priest in Union with Christ, "The Priest's Communion", emphasis added)
I'm not sure exactly why Garrigou-Lagrange draws this rather strange conclusion (I highly doubt that St. Alphonsus would hold it), but it's perhaps a sign of some problematic approachs or views in many modern scholastics: an ultra-formal way of speaking about things; in regard to the moral life, an excessive concern with tidily categorizing all kinds of actions; in regard to the priesthood and other sacraments, a tendency to over-reify (admittedly, this last tendency was not limited to scholastics, nor were all subject to it).
Also striking is that he draws this conclusion despite remarking that in general nothing is lost by the fact that people only receive Christ's body under the species of bread, and not the Sacred Blood.
"Nothing is lost by this (that is, by the body being received by the people without the blood): because the priest both offers and receives the blood in the name of all, and the whole Christ is present under either species" (Summa Theologiae, III, q. 80, a. 12, ad 3). Under the species of bread there is also present, by concomitance, the precious blood. Thus the faithful are not deprived of any notable grace, and a fervent Communion under one species is far more fruitful than a tepid Communion received under both species.