It really depends on ur baby which unfortunately u won't be able to know yet. I had Mamaroo but my baby is the kind who couldn't sleep unless I latch him. Many times we tried to put him in, he'll stay quiet but just refuses to fall asleep. So we lent it to my cousin for use instead and her girl wld sleep in it almost instantly! But now at 5 months, they're having prob 'weaning' her frm it as she refused to sleep without it.
I don’t bother buying a expensive rocker. I train my girl to only slp in cot in her room, not any other place. And they outgrow rocker super fast. No point