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From a post in the ogames forum.

Now some of the advantages and disanvantages i recieved per PM or learned by my own experience:

Battle Ships:
Battle Ships are a useful ship because of their high speed and high
cargo capacity. They’re, as long as you don’t build a lot of Light
Fighters as cannon fodder, not cheap and do also need a lot of Deut
(fuel; in production they don’t cost any Deut).

Cruisers:
Similar to Battle Ships, Cruisers are very fast. They have rapid-fire
(more than only one shot per round) against Missele Launchers, so there
as made for attacking defences. Another advantage is the low need for
fuel, but they cost a lot of Deut in production. The weapons are not
very strong, so it is the best to use it against defence and/or Light
Fighters (Cruisers have a rapidfire of four against them).

Light Fighters:
Light Fighters are cheap and easy to produce (the first fighting ships
you can build at the beginning of a new universe). Later you can build
thousands of them as cannon fodder, but you will need a very large
number of them to destroy other fleets. It’s also useful to build some
Battle Ships additionally, which will do more damage than the fighters
could do alone.
You will also not need very much Deut for them, neither in production (3,000 metal and 1,000 crystal) nor as fuel.

Bombers:
Bombers are one of the best ships to kill defence. They have rapid fire
against most of the defence structures and don’t have problems to beat
them. After researching Hyperspace Engine their speed is acceptable,
but before you got this upgrade, they are very very slow. Another
disadvantage is their high cost of Deut in production.

Destroyers:
Destroyers are large, resistant ships with a high weapon power and are
not easy to destroy. Anyway, they also cost a high amount of Deut in
production and as fuel and are not really fast.

Heavy Fighters:
Heavy Fighters have better weapons than their ’small brothers’, the
Light Fighters, but they are almost as easy to build as them. But their
shields are not very high and they are also hardly able to carry much
fuel.

I hope, some of you learn something from these list and the others may
enjoy the statistics, what kind of ship is the most used one. The
advantages and disadvantages are, indeed, not very detailled, but to
estimate this one should know each gamer’s tactic.
If you know some more advantages or disadvantages which are not listed up here, write me per PM

NOTE: 3/2006 - Alliance name was changed from MAD to THEHOOD.