SanDisk Extreme PRO 256GB CompactFlash Memory Card
Much like the Professional 1066x series from Lexar, this is an excellent CompactFlash card intended for professional use. You get great performance with this card, and it matches the Lexar series with maximum speeds of 160MB/s which is ideal for rapidly photography, video, and support for 4K video. The high speed also makes this a great model for transferring data from the card to a computer.
This particular model is the maximum size for this series with 256GB of storage which should be more than enough for professional photographer; four other sizes are available including 128GB, 64GB, 32GB, and 16GB. In terms of speed and storage options, this model is the equal of the Lexar Professional 1066x series. Ultimately, your decision will likely come down to personal preference, but you might also consider the prices of each card, which can vary depending on retailer and current sales.