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For S2S and TIGGE perturbed forecast (type=pf) webAPI offers "number" keyword for selection of ensemble members, ECDS doesn't offer this and one is forced to download all ens members.
For example,:
- TIGGE, type=PF, ~60% of requests retrieve all ens members
- S2S forecast, type=PF, only ~25 % of requests retrieve all ens members
- Public data portal is notably more responsive (quicker) than ECDS data portal (for selection of keys / variables) !
- CDSAPI request doesn't contain MARS output and therefore it is more difficult to debug erroneous requests in comparison to webPI !