What grows together, goes together.
In other words, Spanish wines usually go well with traditional Spanish paella.
Some would say that wines from the region of Rioja, in general, make the best wine with paella.
For example, rioja reds, many made with Tempranillo grapes, pair well with seafood paellas, as do many white wines.
Valencia or mixed paellas, on the other hand, work particularly well with dry rosés and red Grenaches.
The best wine for paella Valenciana, as mentioned above, might be a dry rosé or a medium-bodied red.
For a paella mixta, you might try a white Merseguera, produced in the high Alto Turia area.
Its acidity will work well with the combination of ingredients.
Or, a Tempranillo/Grenache blend from Rioja is also a great wine with paella mixta.
When thinking about paella and wine, remember to keep in mind the base ingredients.