$2,000,000,000 versus $2,000,000
The one is about $24 per taxpayer, the other about ten cents.
Based on known recovery rates, that $2,000, 000 would result in the certain recovery of multiple meteorites from Mars, whereas that $2,000,000,000 would result in maybe one sample, if it worked at all.
Hell, maybe NASA could find someone from Texas to make the trip, so the money would even go to a red state.