The AE2000 is not really all that bright a projector, so keeping within / at 100" diagonal is your first best step.
This opens you up to several choices, the best and least expensive of which is painting an applicable high gain, high contrast coating onto a White, solid substrate
Neither of the materials you were considering above are well suited for your purpose. The first being both expensive and sub-1.0 gain, the latter being even more expensive and still under 1.0 gain.
The need for even occasional watching in ambient light combined with your PJs performance envelope necessitates the need for an effective positive gain Gray surface solution.
Using a painted surface with those qualities will assure you of having a surface that is not laden with texture, nor nearly as expensive. It does however require at least a degree of DIY'ism...not really much removed from constructing a frame and stretching Mfg Cloth across it and trimming it out with a boarder, just a different approach. By any reasonable estimate, the overall cost would be in the range of the the cost of the first "linked to" material alone, but well under the cost of the latter. (by 75% less)
Now first, the placement of the PJ should be optimized. Mounting it so the face of the Lens is at 10' 4" is a biggie.9' 10" is the minimum required for a 100" diagonal image, so your close to that but not so close that you do not have some adjust-ability with your Zoom, but close enough your not wasting any of the PJ's luminosity.
A 4' x 8' sheet of Thrifty White Hardboard at Home Depot cost $13.00 (...not 6.75 sq.ft.
) Cut to 85" x 48" = 100" diagonal
A simple Light neutral Gray paint mixed from a Interior Flat Enamel and applied via a Roller is silly inexpensive. Combining such with a few extra ingredients can up the gain to just over 1.0. Total cost of a good paint mix? approx: $50.00
If you wanted to / could, spraying whatever coating would be preferable. A good Sprayer we suggest often only cost $50.00
Great looking Black Velvet Trim would add about $40.00
Miscellaneous materials: $30.00
Most expensive combination of the above: $183.00 . That is just $15.00 more that the basic cost of the least expensive Mfg material, sans any expense for Frame building or Trim.
So at this conjecture, the real questions are:
How good do you want your end results to be?
How much DIY'ism can you / are you willing to contribute to achieve "best case" results.