Apparently some places, but not many use LPNs in their L&D room. My employer hires only RNs for L&D.
For a wider variety of job opportunites at greater pay (up to 7.00/hour more) go for the RN.
Good luck. I'll move your question to the OB forum and they can advise you further.
edit. I just noticed your in Canada, it might be different there. I'm talking USA about the pay and opportunities. Good luck.