Which one would you go with ?
Colab pro (10$/m) 90min idle time, 24 hours maximum session duration , 12h runtime, T4 or P100. 25gb ram, 2vCPUs
Gradient Pro (8$/m) no idle time, No maximum session duration , 6h runtime, A4000 RTX5000 RTX4000 P5000 P4000, minimum 30Gb ram, 8vCPUs
Colab pro has T4 or P100 which are superior the gpus offered by Gradient
My dude, as always, the answer is: it depends on what you need. Without any details, the only possible answer is pick one and see if it works for you.