Depends on your needs; if you are doing a MR to retain status the 25k doesn't get you anywhere. You can't earn 25k with a $200 voucher, but you can earn valuable MQM and a few RDM too.

Of course at this point in the year, it's always hard to tell if a MR is needed, and I always try to snag a VDB over the year which is usually worth more than $200 and non-combinable. Still, worth considering that you can earn miles with the voucher.