RIOT vs WULF vs BITF vs MARA

Hey I am a bitcoin noob and I am looking at investing in these miners. Can someone give me advise?

Seems like WULF has the most energy and monet efficient production - 17k per there recent statement compared to the other RIOT 27k, MARA 33K. I don't know much about BITF.

However, WULF has lower production rate. Given the recent explosion in its stock price, is it overvalued? It seems like RIOT is better poised but there is internal news about stock manipulation and shorting, etc. What's the play here? Is it all speculative or is there a clear strategy to count on?