Aye IIRC generally you probably want a deal with a standing charge if your usage is normal/high as the slightly lower unit cost averages it out a bit.
You don't want a standing charge if you don't use much/the property is vacant for long periods (IE a second home/house that is only occupied for a few hours a day).
From memory the "standing charge" was originally intended to offset the cost of infrastructure and repairs to the supply so wasn't linked to the actual unit cost, effectively it was almost an insurance everyone paid to help cover the cost of replacing the cables if something goes wrong (similar to line rental for the phone where it helps cover the physical costs of the wiring and doing repairs to the incoming cabling).
I'm a little worried about how much ours is going to go up, so far I don't think I've had any actual information from British gas, but I'm expecting it to be nasty, we're already paying around 35-40 a week
(4 bed dethatched with 3 people in it almost all the time).
On the plus side we've got it about as energy efficient as we can realistically manage*, and I finally sorted out insulation for the loft hatch last year which seems to have made a surprising difference as at times I used to be able to feel a draft under it (I bought some kingspan foil backed insulating foam and cut it so it's 3x 25mm layers that are a really snug fit).
*Thank god for LED lights, my dad's eyes are bad so we've got to have plenty of lighting in rooms he uses a lot, the living room used to have ~600 watts of incandescent, it's now around 30 watts of LED.