Hi Jan,
SLT100 is a specialized SLT training which is for 3 days.
Where as HA350 is a 2 day training course covering different Replication topics like SLT, Data Services, DXC (Direct Extract Connection), Sybase Replication Server, Flat File upload and Smart Data Access.
If you want to learn about different Replication topics I would recommend you to attend HA350 and and if it just SLT then SLT100 will cover it in detailed manner.
Regards,
Mithun