which certification is better to take cca 175 or HDP Certified Developer:Spark (HDPCD:Spark)
Cloudera is more recognized than HDP.
But if you are using Cloudera/Hortornworks platform on any live project or POC doing certification with the same vendor should be first preference of your choice.
HDP :Spark - authorizes you only on Spark Core and SQL
Cloudera CCA 175 - Its big package- Sqoop, Flume, Spark Core, Spark SQL, Spark Streaming, Hive, HDFS
This is my opinion from purely based on my work experience. Personally I know both are equally beneficial and its just a choice you have to make based on your interest.