I said this in another post:
I've had both of of the triggers mentioned and the lion mentioned in my tank at the same time. They got along very well.
You can mix triggers and lions if you use caution. There is no overall rule that says "absolutely no triggers with lions." I and many others, have done it successfully numerous times.
If you're going to mix the two, you need to do some research:
-What type of trigger do I want to mix with my lion?
There are many different types of triggers out there and each one does not act the same way. Look at the profile of a particular trigger (use a few different sources), ask others on their experiences with a particular trigger.
-Can you veiw the trigger?
If you have the opportunity to view the trigger at the LFS, see how it acts with other tankmates, this can be a good indicator of aggressiveness.
Like other aggressive fish, try to add them last, get them a little smaller, and provide plenty of tank space for them. Have a contingency in case things do not work out.
In my opinion, in this hobby there are very few absolutes in regards to compatability.
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It can be done, but you need to do it right. If you don't want to worry, go with the dwarf.