I would actually bottle the first few batches. I decided I wanted to open them over time to see how the flavor changed, see what I liked, and let some sit for a long time too. This would be tough to do in a keg unless you start stock piling kegs. Since it is your first batch, and if you are interested in learning how the flavor changes with conditioning, and if you want others to try the results of your new hobby, you should bottle. Once i settle on the recipe that I want to make and the timeframe it takes to ferment, condition, and be drinkable, then I will start kegging that, but I don't have the space or the $$s for equipment it would take for the 21 varieties I have made since February if they were in kegs.
If you are only making one kind, want to drink as fast as possible, and don't care about tracking the changes, then keg away.