As with many things, it’s not necessarily as easy as A or B.

With the Eddy heads you can likely reuse the rockers and pushrods, and if you already had arp head bolts with the stock heads, you’ll be able to reuse those as well.

The TF heads will require those items be replaced from the different parts than you used with the 906’s.

So, while the TF heads are a better bang for the buck, they do cost more than the Eddy’s.
And, l you may have to buy some parts that you could possibly reuse if you ran the Eddy’s instead of the TF heads.

On the other hand, if you were running oe rockers/pushrods/head bolts, then you’d probably want to upgrade all that stuff with the new heads anyway.