I have a 21 plate 110bhp 5 speed box T28 Campervan . The 5th gear is very motorway/dual carriage way oriented in my opinion you spend more time in 3rd or 4th in normal driving particularly rolling roads with bends 5th is just too long. Torque isn’t dramatic either but sufficient enough though long climbs loaded require use of low gears earlier than other vehicles I have driven.
Round town and local A roads it’s ok but to get the best it needs the lower gears working which makes it a bit revvier. It goes along well and smooth enough . Economy is fine imo eg 460 miles this weekend to Devon A roads, urban and motorway for half of it used just over 3/4 tank.
I think if I had the choice between a manual 110bhp 5 speed and 150bhp 6 speed (price being equal) I would go for the 150 mostly because I would like a little more torque and better gear range , but if the 110 was in better nick I wouldn’t have an issue having one again, though in your case £2k more and year newer might sway it also especially with a cheeky offer ?. All being said we have discussed a remap between us to give it a bit of peppiness across the range, currently undecided as its been fine so far if honest we just cruise along at 65-70 on motorway which it’s fine with.