I will gladly help you Insilin, as I've been in your shoes before - I know what it's like!
First of all, your questions are a matter of opinion, for example, what are your classmate's favourite cars? - I bet almost everyone's is different?
With this in mind, I can't answer the 'best plane' question.
Submarines aren't my forte, so I won't go there.
Also, what have they taught you in school/college on WW2 vehicles? (I bet a lot of it is wrong BTW).
Anyway, best Canadian WW2 tank:
Has to be the Valentine for me; It was designed in Britain (the design was submitted on Valentines day - hence the name). It was designed as a cheaper version of the MatildaII tank, which had proved superior to the German Panzers in the battle of France. The Canadian version was made at a place that usually made trains (forget the name, will get back to you later). The Canadian version was actually superior to the original, being cheaper, better armoured and likely was more reliable and of a better quality. Most of the Canadian Valentines were sent to the USSR, but a few were left behind in Canada for training purposes.
When they got to Russia, they were used by the Russians and were the most highly praised of the British/Commonwealth tanks - being the only ones that could really cut it in the harsh conditions on the Eastern Front (others were either underarmoured and/or unreliable). One complaint was that the gun was near useless. The Valentine had a 57mm gun (called the QF six pounder) - which was better than the 40mm (QF 2 pounder) of the MathildaII mentioned above, but not good enough as it's armour penetration was poor and it couldn't fire HE shells (High Explosive - look it up!). The Soviets had a better 57mm gun, but they also had an excellent 76mm that was famously used in the T34 and KV1 (You were told about the T34 and KV1 and their significance in WW2, weren't you?). This could fire HE and had good anti-tank performance, so was shoehorned (I expect with great difficulty) into the already very cramped turret of the Valentine. This made a very 'Soviet' tank; well armoured, reliable, simple, cheap and with a big gun - but very cramped and uncomfortable - all features of Soviet tanks. At this time the T34 was unreliable - it's gearbox kept breaking, spare gearboxes were actually carried into battle strapped to their backs! On the 1st link I have given you, there is a report on the reliability of the T34 and Valentines in the Eartern Front and the Valentine actually comes out better! (You were told about the T34's reliability, weren't you?). The KV1 was more reliable than the T34 at this point, having being tried and tested in the 'Winter War' (Which I hope you were told about?) and, depending on your opinion, better than the Valentine/76 but it was heavy and had sloow acceleration. The Valentine/76 could take on a PanzerIII and earlier marks of PanzerIV. The reason I chose the Valentine is because it made a large contribution to the Soviet offensive against Nazi Germany, including the famous Kursk tank battles (Which, again I hope you were told about?) - and this is where WW2 was really won/lost.
- I guess that people on here might disagree with me, that neither makes them right or wrong.
The RAM tank was interesting too, for it's conversions - but it didn't really make a contribution to WW2, other than training and as an APC (Kangaroo). A few prototypes carried excellent British guns - the 17pdr and 3.7in, which were the only guns to really rival the famous German '88'.
There you have it. I'm not doing a bibliography for you though, try looking up 'valentine tank russia canada' 'canadian valentines' or something on Google for sources. Though I will give you a few links:
The Russian Battlefield - Valentine Medium Tank in the USSR
The Russian Battlefield - Mk.II "Matilda" Heavy Infantry Tank
Valentine tank - Wikipedia, the free encyclopedia
T-34 - Wikipedia, the free encyclopedia
Kliment Voroshilov tank - Wikipedia, the free encyclopedia
Matilda tank - Wikipedia, the free encyclopedia
F-34 tank gun - Wikipedia, the free encyclopedia
Ordnance QF 6 pounder - Wikipedia, the free encyclopedia
ZiS-2 - Wikipedia, the free encyclopedia
I hope you keep researching WW2 vehicles and that it's something you stay interested in long after college/school is over.
If you want to have fun whilst doing tank research, then I suggest you play a Playstation game called Panzer Front. You do have a Playstation/Playstation 2 don't you?
Let us know how it goes?