Hi kiara, here is a really good rabbit food comparison chart
Bunnie House - Food Comparison Chart

as u will see Wag has 10% fiber, really you want to be aiming for 1 nearer the 20% mark. I use Burgess Supa Rabbit Excel which you can buy in most pet shops, or they can normally order you some. I have just read the pack and mine is 19% fiber, so I think this list is out dated.

In terms of mix vs pellets, I moved my bun on to pellets about 2 years ago as she would never eat the grains in the mix . after spending a month gradually making the transition, she now goes mad for the excel pellets. I would like to get my hands on some of the Allen and Page as it seems to be what the superior rabbit breeders use, however I havent got the room to store a massive sack.

I really think the quality of the feed you give ur buns is important, also since using pellets I seem to be going through a lot less food saving £

Also as mentioned I give my bun at least 4 different bits of veg a day, plus some herbs(really easy to grow urself), plus a handful of grass (as shes indoors), plus a handful of new timothy long strand hay(she doesnt like the other stuff from wilko etc), plus some dried grass(such as redigrass), and then only a small handful of pellets, usually half in a treat ball and half in her bowl (the pellets seem to be the only way I can get her to go home at the moment shes being a right madam)

anyways.... another rant from me but I really hope this is helpful, please ask if something is confusing.