Renewable gases are deemed to play a central role in future energy supply scenarios. Synthetic natural gas (SNG) from woody biomass can support this strategy by producing an already established energy carrier on a renewable basis. This study suggests advanced process routes for the production of SNG via dual fluidized bed (DFB) gasification and catalytic fluidized bed methanation and draws conclusions towards their technical and economic potentials. The suggested routes comprise advanced DFB gasification, sorption enhanced reforming (SER), and external hydrogen addition in a hybrid process for increased carbon utilization. The results show that the integration of a polishing reactor downstream fluidized bed methanation can reduce the electricity consumption of the process by 17%-38% while ensuring the high gas quality necessary for natural gas grid injection. The production costs (excl. taxes) of the DFB route for 100 MW fuel input amount to 75 €/MWh in 2022, including revenues from district heat and captured CO2. If the circumstances do not allow the assumption of a CO2 price, the SER route leads to a 16% more cost-efficient process compared to the DFB route. The addition of external hydrogen approximately doubles the carbon utilization but increases the production costs to 121 €/MWh. A high sensitivity on the electricity costs is responsible for the increased production costs of this route. Overall, the study shows that advanced concepts can lead to technical and economic advantages of SNG production.