The DNA sequence sections of the three INSDC databases (i.e., DDBJ, ENA Sequence and GenBank) are synchronized periodically and strive to keep their stored data as ubiquitously accessible as possible. Except for idiosyncrasies in their data submission routes, there should be little, if any, reason for preferentially submitting sequence data to one database over another. Yet many researchers display very noticeable preferences!
When asked point blank, many colleagues emphasize that these preferences are not linked to the database-specific data submission or retrieval interfaces available. Yet they cannot provide a technical reason for their choice either.
Maybe researchers base their preference on geographic vicinity ("buy local"), but maybe there are genuine technical reasons for their preference (even if they are unaware of these reasons themselves).
Thus, my question is:
Can you think of any technical reason - however minute or seemingly insignificant - in preferentially submitting DNA sequences to NCBI's GenBank over ENA Sequence (or vice versa)? For example, there may be differences in data storage or accessibility that are relevant to you.
Put differently: Short of flipping a coin, why would you (as a bioinformatics-prone end user) select one database over the other for your data submission?
Edit 1: Many SE posters attempt to reassure me that I can submit my DNA sequences to either database and that "the data will be just fine there". Having submitted data to both GenBank and ENA Sequence for 10+ years myself, this is not what this question is about. Instead, this question is about carving out genuine technical differences from a user perspective.
Edit 2: Since no answer has been posted yet despite a bounty, I figure this is a hard question as specified. Thus, I will broaden the question and now also accept non-technical reasons for preferentially submitting DNA sequence data to either GenBank or ENA Sequence. (That being said, I still hope for someone listing a technical reason.)