Greenplum database storage model for time series data

I have to deploy a greenplum database for analysis of time series data. I will have around 50 different time series (s1,s2,s3,...s50) and each series will have multiple pairs (time is 1 hour average over 2 years)

I can store this data in two formats: Format 1:

Series  T1  T2  T3  T4  …
s1  val val val val …
s2  val val val val …
s3  val val val val …
…   …   …   …   …   …

Format 2:

Time    Series1 Series2 Series3 …
T1  val val val …
T2  val val val …
T3  val val val …
…   …   …   …   …

In case of Format 1, I will go with row oriented table. For format 2, column oriented table is a better option. This is because most of my queries will be to fetch data for a single series over a specific time duration. Also, I will update the table in bulk periodically (for example every month).

Which format is better suited for my needs?