It's best to transcend when able. At some point, you'll reach the last evolution while waiting to reach the number of Evocytes neccessary for your next Transcention.
i already reach form 23 for 682, i dont know how much evolution there is since the game doesnt tell me, so i dont know what's the final evolution is, and too afraid to use trascend since my progress already went too far
Then you're nowhere near the end. 682 has 32 Evolutions total, the last one is reached at 100T Cells. Transcention makes those numbers way easier to reach.