Well, I consider it a happy ride if I have a chance to sit down...

Yes, the buses have handles and everything for standing passengers. Wider aisles and stand-only areas instead of more seats too. The inside of the bus look like a tram/metro rather than long distance bus/train.

Yes, emergency stops are not comfortable. Some old lady falls and breaks her hand every few years. But trams have traffic lights and may have to do emergency stop too. Trams probably have less emergency stops per km travelled. But I never considered this a huge issue.

AFAIK, bus service regularly train drivers to drive "nice-to-passengers". Park close to curb, avoid emergency stops, start smoothly etc. I guess there's a risk for this problem, but it seems to be manageable.

Timetable rules may be a big factor too. I heard more bus drivers loose bonuses for driving faster than schedule than for being (unreasonably) late..

The interior of a bus doesn't need to be any different than the interior of a tram. Unless your city is repurposing coaches for public transport, the interiors of buses should have ample standing space.

In my experience trams trend to be wider than buses by a noticeable margin.

Here in the UK, trams (at least for Croydon[1][2], Metrolink[3], Newcastle Metro[4]) seem to be standardised at 2650mm width whilst the New Routemaster[5] is 2520mm wide. Probably not a noticeable margin (130/2650 =~ 5%).

[1] https://en.wikipedia.org/wiki/Bombardier_CR4000 [2] https://en.wikipedia.org/wiki/Variobahn#Variobahn_trams_for_... [3] https://en.wikipedia.org/wiki/M5000 [4] https://en.wikipedia.org/wiki/Tyne_and_Wear_Metro_rolling_st... [5] https://en.wikipedia.org/wiki/New_Routemaster

It's worth noting that buses often have space taken up by the wheel arches, engine and stairs which can make them feel a lot more cramped than a tram with a similar footprint, which have floors elevated to platform level.