Frankly I don't think there's going to be much difference between what KF is suggesting and what I use.  Remember, you'll have to have 2 different ones of the former, probably a coarse and a fine.  Matter of personal taste I guess but I like having more stone to run the blade along for a nice fluid stroke, plus I like that it all folds into one neat relatively little package.  But since you'll actually have both styles in hand you'll be able to make exactly the choice that suits you best.  Have fun.