Either is a decent deal. Hegner have an incredible reputation but it's one of those that is perhaps a little pedestal-like, by which I mean they get trotted out as the example of top quality and that risks becoming an assumption that they are unequalled. It similar to Rolex with watches - top quality, yes, but at a premium price and there are alternatives of equal quality and probably better value.
I can't claim first hand experience of the Deltas, but they have a loyal following.
@loftyhermes is the resident Delta expert here and hopefully he can advise on the example you have found.
Spares for a Hegner are renowned for being overpriced but those for a Delta are likely to prove unobtainium here in the UK.
Which to choose? As I opened with either is a decent deal and I wouldn't be distracted by the distance to the Hegner, it's the kind of thing you forget about after you have the machine. I would look into if the Hegner is single or variable speed since I can't make it out from the photo. If it's variable I'd go for that, absolute bargain.
If not and I wanted a saw now I'd opt for the Delta since it is at least two speed, but if not in a hurry I'd be tempted to wait. The used scroll saw market isn't particularly liquid, and if you wait a while the right machine will turn up at the right price in the right location.