I wouldn't exactly call the Ex-Glasgow E300s solid underneath... The outgoing Streetlites are better in that regard, but the running gear itself is better on the E300s.
Aberdeen have been wanting to standardise the diesel single deck fleet on the E300s for quite some time. When looked after they're very reliable and cheap to run, albeit since the fitting of the Euro 6 exhaust systems they've been plagued by emissions lights. The Streetlites in comparison are not as reliable and not really suited to the Aberdeen network with their cramped interiors.
To be fair 63208 is one of the better ones. The Streetlites vary depending on the gearbox programme as not all of them are the same, it tends to be that you either get one that's fast and jumpy or sluggish but less jumpy.
Glasgow have actually done not too bad with the Ex-Aberdeen Streetlites. Most of the ones they've received are the better ones of the batch. 63209 in particuarly was very good. In contrast Halifax getting 63194 and 63196 is rather unfortunate for them.