Welcome here! That’s great you’re thinking of getting another bunny!
I have never heard of the Excel pellets. Most of us here recommend Oxbow, American Pet Diner, or Zupreem brands. You want a pellet without any extra bits (no seeds, nuts, cereal pieces, dried veggies). Just a plain timothy-based pellet.
Binkybunny has diet info. Here is the page: https://binkybunny.com/BUNNYINFO/Diet/tabid/60/Default.aspx
These are the nutritional values you want to look for when choosing a pellet:
Recommended Nutritional Value: (Compare these against yours)
Fiber 18% minimum (20 -25% best)
Fat 1 – 2% max,
Protein 12 – 14% max (long-haired breeds,angoras, need higher)
Calcium 1% max
Edited: I tried to do a search for Excel rabbit food and it’s bringing up “Burgess Supa Rabbit Excel”. It looks like it may be a UK brand. Is this where you are located? If you are out of the US, I don’t think the brands I recommended will be available for you.
http://www.burgesspetcare.co.uk/
That’s the website… I do not see nutritional info for the different types of food.