While the DL One and LX C seat both are Thomson Vantage they have differences, most notable being that LX are 79" when flat vs 76.5" on DL (according to AeroLopa at least).

The LX C single seat bulkhead footwells are wider than the regular single seat ('throne') footwells. The seats in pairs on the windows (AB), single window seats (K) and those in pairs that are open to the aisle (basically even D/odd G seats) also have wider footwells. Obviously seats in pairs are less favourable for solo travellers and those open to the aisle have that disadvantage too.

On the A333 the wider footwells are all seats in rows 4 and 6 (the bulkheads) and, for example, in row 5 5A/B/G/K but not 5D.

Height of the footwells is better on the bulkhead seats but only marginally IME.

The minicabin is quieter, generally, but I'd pick 6A over any row 5 except 5K.