Of the two, Koppu is the more destructive. It's stronger and is passing over densely populated areas in the Philippines. The central pressure still listed as a low 945hPa. This is the path from the Japan Meteorological Agency, moving slowly NNW:
Champi is listed as strong, rather than very strong, like Koppu. It's also moving slowly NNW, with the central pressure listed as a low 955hPa. From JMA:
The most recent reports I've seen from the ABC say that Koppu has displaced 15,000 people, but there are no casualties reported so far. It's moving slowly, and it's expected that there'll be very large waves and storm surges, as well as the rain and winds.
Koppu set a new record for the Pacific, according to Wunderground's Philip Klotzbach, bringing to 19 the number of Category 4 or 5 tropical cyclone this year in the Northern Hemisphere. I don't know if the 19 includes Champi, or if that brings it to 20.
#Koppu is 19th Cat. 4-5 of the N. Hemisphere season, setting the full-season record. Old record was 18 in 2004. pic.twitter.com/lUc4LUnHkO— Philip Klotzbach (@philklotzbach) October 17, 2015
You can read more about the typhoons:
- Super Typhoon Koppu Could Hit Philippines as a Cat 5 - Jeff Masters at Weather Underground
- Typhoon Koppu: Homes destroyed, thousands displaced as massive typhoon slams into Philippines - Shirley Escalante in Manila for ABC Australia
- 7.5 million people at risk as slow-moving typhoon smashes Philippines - Lindsay Murdoch for the Sydney Morning Herald