Lots of religions 'offer' Paradise as their goal or reward; only Christianity offers Heaven.
So Christianity is a 'better deal' IF (of course) it is regarded as true, and if Heaven is what you want (in which case, God offers Paradise as an alternative).
But what is the difference between Paradise and Heaven?
Paradise is the perfect place for passive enjoyment. It is like a permanent (and perfect) holiday; a place where all the things that happen to you are enjoyable. A key is that phrase 'happen to you' - in the sense that Paradise is about things happening-to you.
Whereas Heaven is about active participation in the work of God's creation. It is therefore about becoming a god - in Christianity this happens by following Jesus through death and 'out the other side' to become an immortal resurrected Man.
Note: Some Christians regard Heaven as if it were merely Paradise - this may be due to a misunderstanding, or because Paradise is really what they would prefer. After all, not everybody wants to grow-up to become a god - and I see no reason why God would not make provision for such preferences. So there are also permanent children in Heaven, for whom Heaven is Paradise - and these may perhaps outnumber the grown-up gods.
