Depends on whether you plan on buying a weekly/monthly/yearly ticket or using pay-as-you-go.
If the former, use the student oyster as you get a decent reduction on the price of season tickets. If the latter, combine the railcard with a regular oyster card as there's a lower daily cap on fares than without the railcard.
(Original post by Ewan)
It's not really a question as you can use your 16-25 railcard on your student Oyster anyway... It just depends as above whether you want to get a weekly/monthly pass...
I have a student oyster that I load with a travel card each week (usually bus and tube) so with the student oyster it's something like £17 a week. You're telling me I can put my 16-25 railcard on the student oyster as well and get a further 1/3 discount?!
Would I have to be travelling on London overground services or does it apply to tube journeys?