Core distinction
MLGS combines supplied leads with a mailing system. GetResponse is primarily an email marketing and automation platform used with audiences you acquire.
Acquisition
MLGS directly addresses lead supply. GetResponse does not supply an equivalent daily lead stream as its core proposition.
Automation
A dedicated email platform is designed for broader campaign and automation workflows. MLGS's central promise is simpler: receive leads and mail them.
Decision framework
Choose the comparison based on the bottleneck: do you need contacts, or do you already have contacts and need a more extensive email-marketing system?