It makes little (if any difference). The code using an additional bundle is slightly heavier (it won’t make any difference in any practical application) and slightly easier to manage, being more general.
If one day you decide that – before sending information inside an intent – you want to serialize the data to database – it will be a bit cleaner to have a bundle that you can serialize, add to an intent and then feed to a PendingBundle – all with one object.
[update]
A clarification (because of some other answers).
Extras is an additional bundle that each Intent might carry (but doesn’t have to), so there is no alternative between using a bundle or not using it. You are using a bundle either way.
The first time you use putExtra, a mExtras bundle inside Intent is initialized and all the following putExtra are delegated to it. The bundle itself is inaccessible to you (this is by design, to avoid certain kind of bugs).
putExtras does not put your bundle inside Intent. Instead, it copies it over to the current intent bundle (or creates one, as with putExtra). This is why it’s slightly heavier (you have two bundles instead of one and pay the price of copying).
The crux is – if you use putExtras, you still cannot access the real bundle inside the intent. BUT – you have a copy for whatever else you might want to do with it. Like keep around to copy into another intent (if you send a lot of similar intents).