Q: L1B renewal vs L1B to L1A conversion

I am on L1B visa in US and my Visa renew is due in December. Also i have been promoted to Sr manager job title recently from solution designer before 8 months. My company is ready for both L1B renewal or L1B to L1A conversion. I am confused that which should be the safest option. Can anyone suggest ? what is the success rate of L1b renewal vs L1B to L1A coversion ? Assuming i have some managerial now, am i eligible for L1A?

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