We have performed an angle-resolved photoemission study on PrBa2Cu3O7 (Pr123) and PrBa2Cu4O8 (Pr124) which have hole-doped Cu-O chains. Dispersive features with one-dimensional (1D) character are observed in Pr123 and Pr124 and are attributed to signals from the hole-doped Cu-O chains which are approximately 1/4-filled. While, in Pr123, the 1D feature loses its spectral weight near the Fermi level (E-F), it crosses E-F in Pr124. These results suggest that, while the hole-doped Cu-O single chains in Pr123 have instability to charge ordering, the hole-doped Cu-O double chains in Pr124 can get rid of it.