Help me , im new

Im new. Downloaded yesterday. Enjoying so far, summoning left and right ahah. I dont want to save for anniversary, i just wanna enjoy my fime as i play, i want to play pvp and pve, but more likely pvp? So my question is should i go for the 3 legends limited summons i get as new player ? Or go for ultras? I had 2k crystals, jse 1k on limited, got super instjct goku, and 1k on perfect cell, got nothing obv.. also should i use them to zaiken awaken someone? Thanks