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Its all depends upon how much downtime you will get for the migration ?
If you want to use the cross platform migration you need to place the tablespaces in readonly mode which requires a downtime for app perspective. If you get a enough downtime window then you can use Transportable tablespaces. You may also consider about creating a NFS mount point between the source and target with good network bandwidth.
If you don't get enough downtime then you probable need to implement goldengate or streams.
start capturing changes using the golden gate
Perform initial load using the export/import ot datapump
apply the changes through golden gate
sync the source and target
But you may want to check what kind of datatypes your database has, Some specific datatypes may not supported by golden gate
It all depends on how much downtime you have!
Goldengate its best solution for the minimum downtime, but need the network very fast and reliable.
In this case you really need use the cross platform tablespace migration or using the expdp/exp (using parallel for more performance) tools, but using those you need more downtime.