For comfort, small.sizes.. definitely Continental ComfortContact 6..

j5 is good enough.better than silverstone a lot.haha

Cc6 is quiet too..
But dont last long on my iriz.. i doubt any tyre would.. approaching 20k km.. and i feel it wiggling in the rain.. or maybe i was going too fast..

Why want to change to much bigger size? What's the car?

You cannot increase tire size like that! It's 4cm larger diameter or almost 7% larger already. You will have clearance problem with the fenders, bad acceleration and fuel consumption,  poor handling and even worsening braking distance. You should always try maintain about the same diameter.

Cannot, actually 195/55/15 is already 1.7% larger than your stock size. Ideally you should only use 185/55/15.

Like Guest and other members had mentioned, personally I wont change beyond stock rim measurement.

Upsizing tire bring alot of downside to the practice. First of all, you are making your car heavier, hence higher fuel consumption.

Second, your car is aligned and tuned to run that particular size, now by upsizing you are incurring further stress to the suspension system, spring, bushes, dampers, rods, etc.

Thirdly you your odometer is not going to shows correct speed readings as well, since its not calibrated for the new sizing.

Im not saying dont upsize, do it if you understand the mechanics and with proper accessories as mentioned above, goes together with the upgrade

If you want stability, just use wider tire, that should be sufficient. Just my two cents 

You feel heavier because of more unsprung weight (bigger rims, bigger tires usually bigger weight unless you buy much lighter rims), bigger rolling diameter, and wider tread.
Like I said depends on car size. For example my Mark X is best with 18 coz can still use tires with around 10-10.5cm sidewall height but my Evo is best with 17 coz with 18 the sidewall becomes too thin (less than 9.5cm). For me personally the best is to maintain around 9.8-11cm sidewall height for best balance of dry/wet performance and comfort. Anything thinner than that becomes a bit too harsh, anything taller than 11cm will feel more wobbly.

Get PS3 much better.

Personally PS3 and TR1 I can’t feel any obvious superiority from the former. If PS4 then yes it’s much better but too bad PS4 is unavailable for that size. At the end of the day it’s a normal passenger car, it’s not like we will be running wild with it. Occasionally climb up genting, those donuts are more than enough to provide proper safety.

imho it's like insurance lah... we normally using maybe 50-60% of tyre's capacity jer... but then suddenly need emergency brake, or heavy rain big puddle... a better tyre always preferred

when I drive fast am alert and prepare exit plan... but cruising time almost always daydream...this is the time easy get in trouble

edit: just ranting in general... not tr1 vs ps3

am using 205/55/16 ps3... to me nothing special because I've never push it to the limit...use like normal tire... wear quite fast, now hard n noisy... I won't buy again because don't need all the "power"

99% of people will recommend ps3 because it's about the best dry n wet grip tyre...hard to go wrong, but not always necessary... so to me more than ok to skip

tr1 don't understand the pattern especially asymmetric tyre... looks awesome but I'll pass

currently I'm very impressed with budget kinergy eco2 on 185/60/15 for dry handling and grip...but it's only so so when wet...if you're a careful and sensible driver...a lot of tyres you can choose