For me Liberty dive center is a no brainer in Tulamben, for 85USD/ 3 dives a day they provide Ntrox for free and a private dive guide without any supplement, you just have to discuss with him in order to schedule your dives, where and when you want to go (actually I rather say "Rare nudibranches" or "Tiger shrimps" and Uji, my private guide for 4 years tells where it's best to spot them).
Weirdly enough I do not stay at LDC, though they have a good resort with fine bungalows but my wife prefers staying at Tauch Terminal (not only because we are regulars there and have return discounts) since they are closer to Sandya the restarant we like and also the grounds are slightly better, tidy as a swiss-german garden can be. LDC picks me up and drives me back every morning it's a matter of a 3 minutes drive, 7 minutes walk but I am too lazy to carry my camera to their dive shop.
To be honest, I consider Tauch Terminal, Liberty dive resort or Ocean view as the best options in Tulamben for accomodations but for diving, LDC is miles ahead. i find Scuba Seraya and Villa markisa to expensive and overrated for what you get in LDC. Plus they are way out of Tulamben (small) town, so you are tucked at your resort.