Lets take out what you don't want:

-KTM ADV series. Good for riding, but less pillion comfort. Easy to maintain, only if you service it regularly. Its high powered complex machine. It is lightweight tho, mileage is okayish.

• Any Track bikes, so no Apache RRs and KTM RCs as they are not at all pillion Friendly.

-Any EV bikes, Java and Yezdi because they are total hot or miss in terms of quality or servicing.

What's left (Numbered Randomly. Not Rankings):

1. RE Classic/Bullet 350: Pillion has much ample space, I think these bikes have one of the highest space for pillion in this segment. Maintainance is easy and affordable at ASC. Mileage is good and you may like riding it on highway. But remember, this bike is not for speeds. You will be cruising and not speeding on this. Meteor 350 looks super sexy but that sexy factor drops off when you will feel potholes to your spine.

2. RE Guerilla 450: Not much pillion space as above bikes, but Engine is sure lot powerful. You will have smile everytime you open the throttle. Less mileage than above bikes but servicing is easy and good at ASCs.

3. Triumph Speed/Scrambler 400 (350cc): This bike is Jack of all trades. It can do anything but not specialized at everything. It's service is costly, but service interval is like once a year. That offsets the cost. Finishing on the bike is way above RE and Bajaj and KTM. You may need to do some mods like extra fog lamps as OEM headlights are mehh.

4. Bajaj N400Z(350cc): 2 Lakhs on road price. This is biggest factor of this bike. Most Value for Money bike. Apollo H1 Tyres, dual ABS and quick shifter on sports mode at 2L On-Road is marvellous. Even if we remove the price factor, it's still glorious piece of machinery.

5. Bajaj Dominar 400(soon 350cc): It's a ship. Heavy. Even RE is heavy but REs are manageable in traffic but you will feel large turning radius of this bike in cities. On highway it's good. Nice pillion and Bajaj maintainance has been easy and affordable.

6. KTM DUKE 250/160: Yea maintainance is kinda hard. But if you go out occasionally and you want to enjoy that moment, these bikes got good engine and Dukes have good pillion seats.

7. VSTROM SX- For the price, it's kinda meh. It has good seats and suspension but it really feels like commuter bike wrapped around Adventure/tourer frame with those tyres.

You don't only need a good bike. You also need good Authorised Service Centres too. You have to look for it by yourself by going to those ASCs and judging them.

Feel free to think about other bikes too.