  Quasiparticle tunneling spectroscopic studies of electron- (n-type) and
hole-doped (p-type) cuprates reveal that the pairing symmetry, pseudogap
phenomenon and spatial homogeneity of the superconducting order parameter are
all non-universal. We compare our studies of p-type YBa_2Cu_3O_{7-x} and n-type
infinite-layer Sr_{0.9}Ln_{0.1}CuO_2 (Ln = La, Gd) systems with results from
p-type Bi_2Sr_2CaCu_2O_x and n-type one-layer Nd_{1.85}Ce_{0.15}CuO_4 cuprates,
and attribute various non-universal behavior to different competing orders in
p-type and n-type cuprates.
