both companies are good and offer good genetics...
typically price reflects three things..
1) demand... some companies charge more for their better selling strains... it doesnt mean they are better than others... and not every company does it.. but as businesses they are out to turn a profit and thats one way of doing it...
2) supply... how much of any given seed does the breeder actually have in stock?? if its a new cross, they have low seed inventory of that strain (assuming its not a flagship strain for that breeder, or its a limited time offer strain they tend to be a bit more... but again this doesnt mean they are better than other strains.. just that they cost more...
3) amount of business they do... some companies charge more for their seeds to make up for the lack of sales they have.. doggies nuts seeds is a great example of that... they do little business.. but charge so much for their seeds (which are highly subpar) that they only need a few sales here and there to make money...
as far as your situation do you want 1 or 2 strains to grow?? again both breeders are good breeders... its just up to you how much variety, if any, you want...
the other thing to consider is that some companies charge more because their seeds are not f1's... big fancy way of saying they are not the first cross seeds.. ill explain a little..
when you take a male and a female and breed them you get f1 seeds... these seeds can have a wide range of pheno types (plant size, structure, colors, ect.. think of your eye color and hair color as phenos)... and they may even have some phenos buried in their genes that dont show the first grow... breeders who take the time to pick ideal plants and use them to breed and back cross with (this isolates good phenos and grows out unwanted ones.. basically stablizing the strain so all seeds grown are almost identical) will charge more for the work they have put into them... each subsequent backcross adds another number to the equation (ie f4s are 4th generation seeds)... unfortunately not all companies will tell you if the seeds you are getting are f1s, f2s, ect.. and you cant always tell by the price...
a good rule of thumb is stick to companies with fewer strains... such as serious seeds.. they typically have more stable strains since they have fewer strains to work with... its a good basic rule.. but non of the above applies 100% of the time... it takes some research...