Hello, I saw a video of ifusion method, but with a different variation, that don0t use a tube to introduce resin, only use one tube to extract the air and excess of resin. 

for 99% of diy and small business automotive use, an autoclave versus oven curing with something like easypreg, you will have no practical difference in performance for the kind of parts you are producing.

With small parts, from a business perspective, using pre-pregs is a considerable cost saver in time far more than the extra cost of the pre-preg.  Also smaller the part, the harder it is to infuse generally. The time spent getting it perfectly into corners of a small part and bagging it properly are far more costly than the simpler laying of sticky pre-preg.