@Jan-ChristophSchlage-Puchta: Overall, the "Article Influence" scores strike me as more accurate than the "Eigenfactor" scores. That said, the scores for all three of the journals you mentioned are high, and indeed all of them are good journals. In my opinion, that's the limit of what OP should try to infer by looking up journals there.

Conversely, your university may allow you to take a year of unpaid leave, to concentrate full-time on the startup.