Intresting:
8 Darlington - Spennymoor.
21/X21 Darlington - Peterlee - Sunderland.
21A Middlesbrough - Peterlee.
22 Durham - Sunderland.
23 Hartlepool - Sunderland.
24 Durham - Hartlepool.
46 Durham - Crook.
48 Durham - New Brancepeth.
56 Durham - Bishop Auckland.
57A Durham - Hartlepool.
81 Stokesley - Marske.
830 Middlesbrough - Ingleton (Dalesbus)
X1 Darlington - Tow Law (particularly Bishop Auckland - Tow Law).
X3/X4 Middlesbrough - Whitby.
X15 Newcastle - Alnwick.
X18 Newcastle - Berwick.
X26/X27 Darlington - Catterick.
X75/X76 Darlington - Barnard Castle.
X93 Middlesbrough - Scarborough.
Moorsbus.

Boring.
5/5A Darlington Bishop Auckland.
Might just be because it's my local route but it's mostly council estates and it takes a week to get anywhere.

22 Middlesbrough - Redcar Ings Farm.
Feel like it takes forever to reach Redcar.

63 Middlesbrough - Redcar.
Long... Last time I did this route it got stuck in terrible traffic, took around 90 minutes to do the route.

64 Middlesbrough - New Marske.
Feels to be a tour through deprived areas and again it takes forever to reach Redcar.

308 Newcastle - Blyth.
Can't bare any route that heads along the Coast Road as you are on and off at every junction. Actually like the rest of the route.

X12 Durham - Newcastle.
I find all the Durham - Newcastle routes boring, especially if they go through Low Fell.

X20 Newcastle - Ashington.
This section of the route is really boring, painfully un-scenic A road blasting.

X21/X22 Newcastle - Ashington.
The bit leaving Newcastle is boring, same reasons as the X20.

Some routes can be improved with allocations of buses I like.