MTS issues

Dear all,
I have two scenarios. Can anyone tell me which is the safest bet.
1. My web application has a COM component(Activex DLL) which I have registered on IIS.
2. My web application has a COM component(Activex DLL) which I have registered in an MTS package.

Of the above 2 scenarios which is the best i.e if my component fails then of the two scenariosn which one will not bring down IIS.

Also if anyone has any other scenario then kindly let me know. Thanks in advance.

MTS is way much better because it handles pooling and is able to do things such as putting up a new version of the component without rebooting. It also manages the components memory usage alot better.