Hi Saphire
The Sigma 150 is indeed a cracking lens - have a look at my plant macro pics in the gallery (Stuart R). The Tamron is also a very good lens but, from my point of view, the Sigma has a couple of advantages
1. You are further away from the plant or insect on the plant with the 150
&
2. The 150 does not extend when you focus unlike the 90 which almost doubles in size and can be a little difficult to use. It can also scare insects away when focussing. It is however, a very sharp lens and is considerably cheaper than the Sigma
Don't think you would be disappointed with either. The choice is up to you!
Cheers
Stuart
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