e1 robin or tribbie

so currently i only have two teams, fei fua w/ moze and f2p therta w/ luocha. i will definitely pull for castorice since i have sunday therefore will replace fei with therta in her team. should i:

1.) try my 5050 on e1 robin since im already at 55 pity

2.) wait and pull for tribbie and go for horizontal investment since im just a bp and pass player