I think that

I think that

because

The reasons for my thinking this are, firstly

so

Another reason is

Moreover

because

These (facts / arguments / ideas) show that

Although                                          and                                are both                                  they are different in many ways.

(One)                           has                                                         

whilst                          has

They are also different in that

Another way they are unalike  is

Finally

Although                                 and                                        are different                                they are alike in some interesting ways. 

For example they both 

They are also similar in

The                                        is the same as

The                                       resembles

Finally they both

Some people think that

because

They argue that

Another group who agree with this point of view are                                  They say that

On the other hand                                       disagree with the idea that                                                               

They claim that

They also say 

My opinion is                                                    

because

There is a lot of discussion about whether

The people who agree with this idea, such as                      ,  claim that

They also argue that

A further point they make is 

However there are also strong arguments against this point of view.                                                                believe that 

Another counter argument is

Furthermore

After looking at the different points of view and the evidence for them I think

because