What type of linear drain are you looking at? Some are primary shower drains and some are not. The ones that are not primary drains work with a primary drain like a three piece clamping drain.
If you are planning a pre-made pre-slope your options in linear drains drops to three choices - Wedi, Kerdi and Proline.
BEtween these three Wedi and Proline offer up the most selection in setting material.
Between those two Wedi's pan is more of a solid piece and Proline's is more of a honey comb you infill.
Can you get access to Laticrete, Mapei, Ardex or Custom Setting materials?
IS cleaning a concern with this drain?
Do you need a hair strainer?
Do you want it to light up?
All questions that need answering to pick the best linear drain for you.
One of my favourite drains is made by Proline but it is one of the hardest to install. The Kerdi drain is very similar to Proline's but the selection in thin sets is to limiting unless you have access to Ardex setting materials. Noble Companies linear drain works well and is easy to install I just don't like the screws that fix the strainer down.
One of the best options out there is the drains from ACO - they are either a primary or non-primary linear drain. The Flanged version is a primary shower drain but I hate that one and would not recommend it. The Plain edged ACO drain however is one of the best drains out there.
Made in Germany
LED's availble .
Hair Strainers available.
Easy to clean.
Take a peak at this Ideabook of mine of Houzz for selecting a drain.
The linear drain top left is a Proline from Quick Drain USA.
The two to the left are from Schluter Systems. The tile insert drain from Schluter was reworked last year and this second version is very good. I'm not a fan yet of their trimmed stainless versions since the trim and grill are so tight.